gnu: python2-pygobject@2: Shorten patch file name.

The file would not be included in the tarball produced by "make dist"
because its name was too long.

* gnu/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch:
Rename to...
* gnu/packages/patches/python2-pygobject-2-deprecation.patch: ... this.
* gnu/packages/glib.scm (python2-pygobject-2)[source]: Adjust accordingly.
* gnu/local.mk (dist_patch_DATA): Likewise.

gnu/local.mk

@@ -1524,7 +1524,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-paste-remove-timing-test.patch	\
   %D%/packages/patches/python-pycrypto-CVE-2013-7459.patch	\
   %D%/packages/patches/python-pycrypto-time-clock.patch		\
-  %D%/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch \
+  %D%/packages/patches/python2-pygobject-2-deprecation.patch	\
   %D%/packages/patches/python-pygpgme-fix-pinentry-tests.patch	\
   %D%/packages/patches/python-robotframework-source-date-epoch.patch \
   %D%/packages/patches/python-shouldbe-0.1.2-cpy3.8.patch	\

gnu/packages/glib.scm

@@ -698,8 +698,7 @@ useful for C++.")
        (sha256
         (base32
          "0nkam61rsn7y3wik3vw46wk5q2cjfh2iph57hl9m39rc8jijb7dv"))
-       (patches (search-patches
-                 "python2-pygobject-2-gi-info-type-error-domain.patch"))))
+       (patches (search-patches "python2-pygobject-2-deprecation.patch"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("which" ,which)