Revert "gnu: gobject-introspection: Update to 1.42.0 and add new patch."

This reverts commit 66717243d0.  Several
packages fail to build with the new version.

gnu/packages/glib.scm

@@ -197,18 +197,17 @@ dynamic loading, and an object system.")
 (define gobject-introspection
   (package
     (name "gobject-introspection")
-    (version "1.42.0")
+    (version "1.38.0")
     (source (origin
              (method url-fetch)
              (uri (string-append "http://ftp.gnome.org/pub/GNOME/sources/"
-                   "gobject-introspection/" (version-major+minor version)
+                   "gobject-introspection/"
-                   "/gobject-introspection-" version ".tar.xz"))
+                   (substring version 0 (string-rindex version #\.))
+                   "/gobject-introspection-"
+                   version ".tar.xz"))
              (sha256
-              (base32 "1xwm7wmr9r9wp6xljb3bckx3a4siybavaq39w46ly7gpskxfv8iv"))
+              (base32 "0wvxyvgajmms2bb6k3pf1rdpnd79xdxamykzvxzmcyn1ag9yax9m"))
-             (patches (list 
+             (patches (list (search-patch "gobject-introspection-cc.patch")))))
-                       (search-patch "gobject-introspection-cc.patch")
-                       (search-patch 
-                        "gobject-introspection-absolute-shlib-path.patch")))))
     (build-system gnu-build-system)
     (inputs
      `(("bison" ,bison)
@@ -229,10 +228,7 @@ dynamic loading, and an object system.")
             (directories '("lib/girepository-1.0")))))
     (search-paths native-search-paths)
     (arguments
-     `(;; The patch 'gobject-introspection-absolute-shlib-path.patch' causes
+     `(#:phases
-       ;; some tests to fail.
-       #:tests? #f
-       #:phases
         (alist-cons-before
          'configure 'patch-paths
          (lambda _

gnu/packages/patches/gobject-introspection-absolute-shlib-path.patch

@@ -1,30 +0,0 @@
-# Names of libraries included in typelib files are opened by dlopen.  Here we 
-# add the full path.
-#
-# This patch was provided by Luca Bruno <lucabru@src.gnome.org>  for 
-# 'gobject-introspection' 1.40.0 in Nix. 
---- ./giscanner/utils.py.orig	2014-08-14 22:05:05.055334080 +0200
-+++ ./giscanner/utils.py	2014-08-14 22:05:24.687497334 +0200
-@@ -110,17 +110,11 @@
-     if dlname is None:
-         return None
- 
--    # Darwin uses absolute paths where possible; since the libtool files never
--    # contain absolute paths, use the libdir field
--    if platform.system() == 'Darwin':
--        dlbasename = os.path.basename(dlname)
--        libdir = _extract_libdir_field(la_file)
--        if libdir is None:
--            return dlbasename
--        return libdir + '/' + dlbasename
--    # From the comments in extract_libtool(), older libtools had
--    # a path rather than the raw dlname
--    return os.path.basename(dlname)
-+    dlbasename = os.path.basename(dlname)
-+    libdir = _extract_libdir_field(la_file)
-+    if libdir is None:
-+        return dlbasename
-+    return libdir + '/' + dlbasename
- 
- 
- def extract_libtool(la_file):