Use "guile-zlib" and "guile-lzlib" instead of (guix config).

* Makefile.am (MODULES): Remove guix/zlib.scm and guix/lzlib.scm,
(SCM_TESTS): remove tests/zlib.scm, tests/lzlib.scm.
* build-aux/build-self.scm (make-config.scm): Remove unused %libz variable.
* configure.ac: Remove LIBZ and LIBLZ variables and check instead for
Guile-zlib and Guile-lzlib.
* doc/guix.texi ("Requirements"): Remove zlib requirement and add Guile-zlib
and Guile-lzlib instead.
* gnu/packages/package-management.scm (guix)[native-inputs]: Add "guile-zlib"
and "guile-lzlib",
[inputs]: remove "zlib" and "lzlib",
[propagated-inputs]: ditto,
[arguments]: add "guile-zlib" and "guile-lzlib" to Guile load path.
* guix/config.scm.in (%libz, %liblz): Remove them.
* guix/lzlib.scm: Remove it.
* guix/man-db.scm: Use (zlib) instead of (guix zlib).
* guix/profiles.scm (manual-database): Do not stub (guix config) in imported
modules list, instead add "guile-zlib" to the extension list.
* guix/scripts/publish.scm: Use (zlib) instead of (guix zlib) and (lzlib)
instead of (guix lzlib),
(string->compression-type, effective-compression): do not check for zlib and
lzlib availability.
* guix/scripts/substitute.scm (%compression-methods): Do not check for lzlib
availability.
* guix/self.scm (specification->package): Add "guile-zlib" and "guile-lzlib"
and remove "zlib" and "lzlib",
(compiled-guix): remove "zlib" and "lzlib" arguments and add guile-zlib and
guile-lzlib to the dependencies, also do not pass "zlib" and "lzlib" to
"make-config.scm" procedure,
(make-config.scm): remove "zlib" and "lzlib" arguments as well as %libz and
%liblz variables.
* guix/utils.scm (lzip-port): Use (lzlib) instead of (guix lzlib) and do not
check for lzlib availability.
* guix/zlib.scm: Remove it.
* m4/guix.m4 (GUIX_LIBZ_LIBDIR, GUIX_LIBLZ_FILE_NAME): Remove them.
* tests/lzlib.scm: Use (zlib) instead of (guix zlib) and (lzlib)
instead of (guix lzlib), and do not check for zlib and lzlib availability.
* tests/publish.scm: Ditto.
* tests/substitute.scm: Do not check for lzlib availability.
* tests/utils.scm: Ditto.
* tests/zlib.scm: Remove it.

tests/publish.scm

@@ -35,8 +35,8 @@
   #:use-module ((guix serialization) #:select (restore-file))
   #:use-module (gcrypt pk-crypto)
   #:use-module ((guix pki) #:select (%public-key-file %private-key-file))
-  #:use-module (guix zlib)
-  #:use-module (guix lzlib)
+  #:use-module (zlib)
+  #:use-module (lzlib)
   #:use-module (web uri)
   #:use-module (web client)
   #:use-module (web response)
@@ -204,8 +204,6 @@ References: ~%"
        (call-with-input-string nar (cut restore-file <> temp)))
      (call-with-input-file temp read-string))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (test-equal "/nar/gzip/*"
   "bar"
   (call-with-temporary-output-file
@@ -217,8 +215,6 @@ References: ~%"
          (cut restore-file <> temp)))
      (call-with-input-file temp read-string))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (test-equal "/nar/gzip/* is really gzip"
   %gzip-magic-bytes
   ;; Since 'gzdopen' (aka. 'call-with-gzip-input-port') transparently reads
@@ -229,8 +225,6 @@ References: ~%"
                (string-append "/nar/gzip/" (basename %item))))))
     (get-bytevector-n nar (bytevector-length %gzip-magic-bytes))))
 
-(unless (lzlib-available?)
-  (test-skip 1))
 (test-equal "/nar/lzip/*"
   "bar"
   (call-with-temporary-output-file
@@ -242,8 +236,6 @@ References: ~%"
          (cut restore-file <> temp)))
      (call-with-input-file temp read-string))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (test-equal "/*.narinfo with compression"
   `(("StorePath" . ,%item)
     ("URL" . ,(string-append "nar/gzip/" (basename %item)))
@@ -264,8 +256,6 @@ References: ~%"
                   (_ #f)))
               (recutils->alist body)))))
 
-(unless (lzlib-available?)
-  (test-skip 1))
 (test-equal "/*.narinfo with lzip compression"
   `(("StorePath" . ,%item)
     ("URL" . ,(string-append "nar/lzip/" (basename %item)))
@@ -286,8 +276,6 @@ References: ~%"
                   (_ #f)))
               (recutils->alist body)))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (test-equal "/*.narinfo for a compressed file"
   '("none" "nar")          ;compression-less nar
   ;; Assume 'guix publish -C' is already running on port 6799.
@@ -300,8 +288,6 @@ References: ~%"
     (list (assoc-ref info "Compression")
           (dirname (assoc-ref info "URL")))))
 
-(unless (and (zlib-available?) (lzlib-available?))
-  (test-skip 1))
 (test-equal "/*.narinfo with lzip + gzip"
   `((("StorePath" . ,%item)
      ("URL" . ,(string-append "nar/gzip/" (basename %item)))
@@ -411,8 +397,6 @@ References: ~%"
                               (call-with-input-string "" port-sha256))))))
     (response-code (http-get uri))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (test-equal "with cache"
   (list #t
         `(("StorePath" . ,%item)
@@ -469,8 +453,6 @@ References: ~%"
                          (stat:size (stat nar)))
                       (response-code uncompressed)))))))))
 
-(unless (and (zlib-available?) (lzlib-available?))
-  (test-skip 1))
 (test-equal "with cache, lzip + gzip"
   '(200 200 404)
   (call-with-temporary-directory
@@ -515,8 +497,6 @@ References: ~%"
                       (response-code
                        (http-get uncompressed))))))))))
 
-(unless (zlib-available?)
-  (test-skip 1))
 (let ((item (add-text-to-store %store "fake-compressed-thing.tar.gz"
                                (random-text))))
   (test-equal "with cache, uncompressed"
@@ -596,9 +576,7 @@ References: ~%"
               (item     (add-text-to-store %store "random" (random-text)))
               (part     (store-path-hash-part item))
               (url      (string-append base part ".narinfo"))
-              (cached   (string-append cache
-                                       (if (zlib-available?)
-                                           "/gzip/" "/none/")
+              (cached   (string-append cache "/gzip/"
                                        (basename item)
                                        ".narinfo"))
               (response (http-get url)))