gnu: glib: Update to 2.56.0.

* gnu/packages/glib.scm (glib): Update to 2.56.0.
[source](patches): Remove obsolete patch.
[arguments]: Disable new MIME test.
* gnu/packages/patches/glib-respect-datadir.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -705,7 +705,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/gimp-CVE-2017-17787.patch		\
   %D%/packages/patches/gimp-CVE-2017-17789.patch		\
   %D%/packages/patches/glib-networking-ssl-cert-file.patch	\
-  %D%/packages/patches/glib-respect-datadir.patch		\
   %D%/packages/patches/glib-tests-timer.patch			\
   %D%/packages/patches/glibc-CVE-2015-5180.patch		\
   %D%/packages/patches/glibc-CVE-2015-7547.patch		\

gnu/packages/glib.scm

@@ -148,7 +148,7 @@ shared NFS home directories.")
 (define glib
   (package
    (name "glib")
-   (version "2.54.3")
+   (version "2.56.0")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnome/sources/"
@@ -156,9 +156,8 @@ shared NFS home directories.")
                                 name "-" version ".tar.xz"))
             (sha256
              (base32
-              "1a60p9m493mvm42rskg8ifr0jmsbr8arzyqx73jshgfwhmkdqgwn"))
-            (patches (search-patches "glib-respect-datadir.patch"
-                                     "glib-tests-timer.patch"))))
+              "1iqgi90fmpl3l23jm2iv44qp7hqsxvnv7978s18933bvx4bnxvzc"))
+            (patches (search-patches "glib-tests-timer.patch"))))
    (build-system gnu-build-system)
    (outputs '("out"           ; everything
               "bin"           ; glib-mkenums, gtester, etc.; depends on Python
@@ -235,6 +234,7 @@ shared NFS home directories.")
                      ("gio/tests/contenttype.c"
                       (;; XXX: requires shared-mime-info.
                        "/contenttype/guess"
+                       "/contenttype/guess_svg_from_data"
                        "/contenttype/subtype"
                        "/contenttype/list"
                        "/contenttype/icon"

gnu/packages/patches/glib-respect-datadir.patch

@@ -1,21 +0,0 @@
-On Guix, Python modules are in a different output from the executables,
-so searching "../share/glib-2.0" will not work.
-
-This patch restores behaviour prior to this commit:
-<https://git.gnome.org/browse/glib/commit/?id=fe2a9887a8ccb14f2386e01b14834e97a33bc2d7>
-
---- a/gio/gdbus-2.0/codegen/gdbus-codegen.in
-+++ b/gio/gdbus-2.0/codegen/gdbus-codegen.in
-@@ -25,9 +25,12 @@
- 
- srcdir = os.getenv('UNINSTALLED_GLIB_SRCDIR', None)
- filedir = os.path.dirname(__file__)
-+datadir = os.path.join('@datadir@', 'glib-2.0')
- 
- if srcdir is not None:
-     path = os.path.join(srcdir, 'gio', 'gdbus-2.0')
-+elif os.path.exists(os.path.join(datadir, 'codegen')):
-+    path = datadir
- elif os.path.basename(filedir) == 'bin':
-     # Make the prefix containing gdbus-codegen 'relocatable' at runtime by
-     # adding /some/prefix/bin/../share/glib-2.0 to the python path