daemon: Use inline functions and variables instead of extern

Avoid separate declarations and definitions for so-called 'global' objects.

* nix/libstore/derivations.{cc, hh} (drvHashes): Use inline instead of separate
declaration and definition.
* nix/libstore/globals.{cc, hh} (settings, nixVersion): Same.
* nix/libstore/local-store.hh (drvsLogDir, deduplicationMinSize): Same.
* nix/libstore/optimise-store.cc (deduplicationMinSize): Same.
* nix/libstore/store-api.{cc, hh} (store): Same.
* nix/libutil/archive.{cc, hh} (defaultPathFilter): Same.
* nix/libutil/hash.{cc, hh} (base32Chars): Same and modify header files.
* nix/libutil/util.{cc, hh} (logType, verbosity, _writeToStderr,
_isInterrupted): Same.
* nix/local.mk: Modified according to the rename of shared.hh.
* nix/nix-daemon/guix-daemon.cc (blockInt, argvSaved, run): Same and
modify header files.
* nix/nix-daemon/nix-daemon.cc: Modify header files.
* nix/nix-daemon/shared.hh: Renamed to nix-daemon.hh

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

nix/libutil/hash.hh

@@ -2,14 +2,15 @@
 
 #include <gcrypt.h>
 
+#include "archive.hh"
 #include "types.hh"
 #include "serialise.hh"
 
 
 namespace nix {
 
-
-extern const string base32Chars;
+// omitted: E O U T
+inline const string base32Chars {"0123456789abcdfghijklmnpqrsvwxyz"};
 
 typedef enum {
     htUnknown = 0,
@@ -79,8 +80,6 @@ Hash hashFile(HashType ht, const Path & path);
 
 /* Compute the hash of the given path.  The hash is defined as
    (essentially) hashString(ht, dumpPath(path)). */
-struct PathFilter;
-extern PathFilter defaultPathFilter;
 typedef std::pair<Hash, unsigned long long> HashResult;
 HashResult hashPath(HashType ht, const Path & path,
     PathFilter & filter = defaultPathFilter);