This reduces the closure from 432 MiB to 160 MiB.

* gnu/packages/cups.scm (hplip-minimal)[arguments]: Pass
"--enable-lite-build" and remove 'wrap-binaries' phase.
[inputs]: Remove all things Python.

Previously the 'dat2drv' and 'locatedriver' programs would be installed
to share/hplip, and thus they would not get stripped during the 'strip'
phase.  Consequently, they retained references to GCC.

* gnu/packages/cups.scm (hplip)[source](snippet): Change "data2drvdir"
and "locatedriverdir" in Makefile.in.

* gnu/packages/cups.scm (hplip)[source](snippet): Remove all the files
matching 'elf-file?', not just ".so" files.  This includes the
'locatedriver' executable found in the upstream tarball.

The reference to Inkscape was introduced in commit
45fef894.

* gnu/packages/gnome.scm (gnome-shell)[arguments]: Add
 #:disallowed-references and #:modules.  Replace the 'glib-or-gtk-wrap'
 phase.

* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Add
 #:disallowed-references and honor it.

* gnu/packages/gnome.scm (aisleriot): Update to 3.22.8.

* gnu/packages/gnome.scm (aisleriot)[source]: Hard-code NAME.

* gnu/packages/games.scm (openrct2): Update to 0.2.2.
[arguments]: Re-indent.

* gnu/packages/games.scm (openrct2-objects): Update to 1.0.9.

* gnu/packages/game-development.scm (python-pygame): Update to 1.9.4.
[arguments]: Re-indent.

* gnu/packages/game-development.scm (eureka): Update to 1.24.

* gnu/packages/virtualization.scm (skopeo)[arguments]: Set #:tests? #f.

* gnu/packages/video.scm (mkvtoolnix)[arguments]: Do it.

* gnu/packages/fonts.scm (font-liberation): Update to 2.00.5.
[source, home-page]: Update project home.

* gnu/packages/xml.scm (libebml): Update to 1.3.7.
[source]: Removed merged patch.

* gnu/packages/xml.scm (libebml)[source]: Hard-code NAME.

* gnu/packages/xdisorg.scm (sxhkd): Update to 0.6.0.

* gnu/packages/xorg.scm (libfs): Update to 1.0.8.

* gnu/packages/pretty-print.scm (highlight): Update to 3.49.
[arguments]: Adjust SUBSTITUTE* regular expression.

* gnu/packages/geo.scm (protozero): Move from here…
* gnu/packages/protobuf.scm (protozero): …to here.

* gnu/packages/xml.scm (perl-xml-feed): Update to 0.59.

* gnu/packages/perl.scm (perl-async-interrupt): Update to 1.24.
[native-inputs]: Add perl-canary-stability.

* gnu/packages/perl-check.scm (perl-test-writevariants): Update to 0.014.
[propagated-inputs]: Add perl-module-runtime.

* gnu/packages/perl-check.scm (perl-test-yaml): Update to 1.07.

* gnu/packages/perl-check.scm (perl-test-trap): Update to 0.3.4.

* gnu/packages/perl-check.scm (perl-test-simple): Update to 1.302162.

* gnu/packages/perl-check.scm (perl-test-sharedfork): Update to 0.35.

* gnu/packages/perl-check.scm (perl-test-mocktime): Update to 0.17.

* gnu/packages/perl-check.scm (perl-test-mockobject)[arguments]: Re-enable tests.
[native-inputs]: Add perl-cgi.

* gnu/packages/perl-check.scm (perl-test-mockobject): Update to 1.20180705.

* gnu/packages/perl-check.scm (perl-test-manifest): Update to 2.021.

* gnu/packages/perl-check.scm (perl-test-harness): Update to 3.42.

* gnu/packages/perl-check.scm (perl-test-differences): Update to 0.67.

* gnu/packages/perl-check.scm (perl-test-cleannamespaces): Update to 0.24.

* guix/download.scm (%mirrors): Add mirrors for the MATE Desktop.

* gnu/packages/emacs-xyz.scm (emacs-magit-svn): Update to 20190216.

* gnu/packages/emacs-xyz.scm (emacs-magit): Update to 20190311.

* gnu/packages/emacs-xyz.scm (emacs-transient): New variable.

* gnu/packages/benchmark.scm (fio): Update to 3.13.

* gnu/packages/storage.scm (ceph): Update to 13.2.5.