gnu: packages: Remove python-build-system comments.

Rephrase or remove comments completely mentioning python-build-system to
prepare it for depreciation. It helps to search code for the rest
relevant entries of python-build-system.

Change-Id: I98ee81b4b0e0f826fd236fec20e77546e1567f80

gnu/packages/build-tools.scm

@@ -430,9 +430,8 @@ files and generates build instructions for the Ninja build system.")
     (arguments
      (list
       #:tests? #f                       ;disabled to avoid extra dependencies
-      ;; Essentially a lighter copy of the former python-build-system.
-      ;; Using it rather than pyproject-build-system allows to edit the latter
-      ;; without a C++ world rebuild.
+      ;; Custom build steps to prevent using pyproject-build-system which
+      ;; allows to edit the latter without a C++ world rebuild.
       #:phases
       #~(modify-phases %standard-phases
           (delete 'bootstrap)

gnu/packages/documentation.scm

@@ -468,9 +468,8 @@ inspired by Dash.")
     (build-system gnu-build-system)
     (arguments
      (list
-      ;; Essentially a lighter copy of the former python-build-system.
-      ;; Using it rather than pyproject-build-system allows to edit the latter
-      ;; without a texlive + haskell world rebuild.
+      ;; Custom build steps to prevent using pyproject-build-system which
+      ;; allows to edit the latter without a texlive + haskell world rebuild.
       #:phases
       #~(modify-phases %standard-phases
           (delete 'bootstrap)

gnu/packages/mail.scm

@@ -1730,8 +1730,6 @@ and search library.")
           ;; tree, so chdir into it before building.
           (add-after 'unpack 'enter-python-dir
             (lambda _ (chdir "bindings/python-cffi")))
-          ;; python-build-system does not invoke the configure script
-          ;; so _notmuch_config.py is missing
           (add-after 'enter-python-dir 'create-notmuch-config
             (lambda* (#:key inputs #:allow-other-keys)
               (with-output-to-file "_notmuch_config.py"

gnu/packages/mpd.scm

@@ -502,7 +502,6 @@ other MPD frontends.")
                (base32
                 "17ys8ccr3h6vix0agvhz859slz0phhk7lwqn5bg4az8s7zgqm3nm"))))
     (build-system gnu-build-system)
-    ;; Manually wrap the binary, because we’re not using python-build-system.
     (arguments
      (list
       #:phases

gnu/packages/python-build.scm

@@ -834,9 +834,9 @@ facilitate packaging Python projects, where packaging includes:
     (arguments
      (list
       #:tests? #f                       ;disabled to avoid extra dependencies
-      ;; Essentially a lighter copy of the former python-build-system.
-      ;; Using it rather than pyproject-build-system allows to edit the latter
-      ;; without a world rebuild (for the meson package in particular).
+      ;; Custom build steps to prevent using pyproject-build-system which
+      ;; allows to edit the latter without a world rebuild (for the meson
+      ;; package in particular).
       #:phases
       #~(modify-phases %standard-phases
           (delete 'bootstrap)

gnu/packages/python-xyz.scm

@@ -5762,7 +5762,6 @@ Unicode-to-LaTeX conversion.")
        (sha256
         (base32
          "03gyss1rhj4in7pgysg4q0hxp3230whinlpy1532ljs99lrx0ywx"))))
-    ;(build-system python-build-system)
     (arguments
      '(#:phases
        (modify-phases %standard-phases

gnu/packages/selinux.scm

@@ -271,7 +271,6 @@ binary policies.")
             (add-after 'enter-dir 'fix-target-path
               (lambda* (#:key inputs #:allow-other-keys)
                 (let ((get-python-version
-                       ;; FIXME: copied from python-build-system
                        (lambda (python)
                          (let* ((version     (last (string-split python #\-)))
                                 (components  (string-split version #\.))

gnu/packages/virtualization.scm

@@ -1075,9 +1075,6 @@ firmware blobs.  You can
                                          ((commands ... prog)
                                           (cons (basename prog) progs))))
                                  (loop (read-line port) progs)))))))))))
-          ;; Wrap all executables with GUIX_PYTHONPATH.  We can't borrow
-          ;; the phase from python-build-system because we also need to wrap
-          ;; the scripts in $out/lib/ganeti such as "node-daemon-setup".
           (add-after 'install 'wrap
             (lambda* (#:key inputs outputs #:allow-other-keys)
               (let* ((out (assoc-ref outputs "out"))

gnu/packages/xml.scm

@@ -1998,9 +1998,8 @@ libxml2 and libxslt.")
     (build-system gnu-build-system)
     (arguments
      (list
-      ;; Essentially a lighter copy of the former python-build-system.
-      ;; Using it rather than pyproject-build-system allows to edit the latter
-      ;; without a texlive + haskell world rebuild.
+      ;; Custom build steps to prevent using pyproject-build-system which
+      ;; allows to edit the latter without a texlive + haskell world rebuild.
       #:test-target "test"
       #:phases
       #~(modify-phases %standard-phases