gnu: glib: Update to 2.54.1.

See <https://bugzilla.gnome.org/show_bug.cgi?id=776504> for the license change.

* gnu/packages/patches/glib-respect-datadir.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/glib.scm (glib): Update to 2.54.1.
[source](patches): Add 'glib-respect-datadir.patch'.
[arguments]<#:phases>: Re-enable timezone test.
[license]: Change to LGPL2.1+.

gnu/local.mk

@@ -653,6 +653,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/ghostscript-no-header-creationdate.patch \
   %D%/packages/patches/ghostscript-runpath.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

@@ -137,7 +137,7 @@ shared NFS home directories.")
 (define glib
   (package
    (name "glib")
-   (version "2.52.3")
+   (version "2.54.1")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnome/sources/"
@@ -145,8 +145,9 @@ shared NFS home directories.")
                                 name "-" version ".tar.xz"))
             (sha256
              (base32
-              "0a71wkkhkvad84gm30w13micxxgqqw3sxhybj7nd9z60lwspdvi5"))
-            (patches (search-patches "glib-tests-timer.patch"))))
+              "18s7rw127wrvb107bkmxd1lmh62b2v19ww5rz7xi0krj34a1ph2h"))
+            (patches (search-patches "glib-respect-datadir.patch"
+                                     "glib-tests-timer.patch"))))
    (build-system gnu-build-system)
    (outputs '("out"           ; everything
               "bin"           ; glib-mkenums, gtester, etc.; depends on Python
@@ -247,12 +248,7 @@ shared NFS home directories.")
 
                      ("gio/tests/gdbus-unix-addresses.c"
                       (;; Requires /etc/machine-id.
-                       "/gdbus/x11-autolaunch"))
-
-                     ("glib/tests/gdatetime.c"
-                      (;; Assumes that the Brasilian time zone is named 'BRT',
-                       ;; which is no longer true as of tzdata-2017a.
-                       "/GDateTime/new_full")))))
+                       "/gdbus/x11-autolaunch")))))
               (and-map (lambda (x) (apply disable x)) failing-tests)))))
 
       ;; Note: `--docdir' and `--htmldir' are not honored, so work around it.
@@ -284,7 +280,7 @@ shared NFS home directories.")
 and interfaces for such runtime functionality as an event loop, threads,
 dynamic loading, and an object system.")
    (home-page "https://developer.gnome.org/glib/")
-   (license license:lgpl2.0+)))                        ; some files are under lgpl2.1+
+   (license license:lgpl2.1+)))
 
 (define gobject-introspection
   (package

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

@@ -0,0 +1,21 @@
+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