Fix test compilation with exa.h in configure when using glibc 2.20.
Inspired by a patch by Peter Hutterer <peter.hutterer@who-t.net>.
See <https://raw.githubusercontent.com/openembedded/oe-core/master/meta/recipes-graphics/xorg-driver/xf86-input-synaptics/always_include_xorg_server.h.patch>.

--- xf86-video-mach64-6.9.4/configure.~1~	2012-12-20 01:16:10.000000000 -0500
+++ xf86-video-mach64-6.9.4/configure	2014-12-19 02:48:18.040097554 -0500
@@ -18370,7 +18370,9 @@
 
         SAVE_CPPFLAGS="$CPPFLAGS"
         CPPFLAGS="$CPPFLAGS $XORG_CFLAGS"
-        ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default"
+        ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default
+#include <xorg-server.h>
+"
 if test "x$ac_cv_header_exa_h" = xyes; then :
   have_exa_h="yes"
 else
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<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 12:18:18 -0500'>2021-11-11</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=f7d88cd4707eeaf02f9b854f05803d8d0428f670'>gnu: libsoup: Update to 3.0.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnome.scm (libsoup-minimal): Update to 3.0.1.
[modules]: Delete argument.
[phases]{adjust-tests}: Re-enable ssl-test.
[native-inputs]: Add gnutls, for tests.  Move nghttp2:lib to...
[propagated-inputs]: ... here.  Add nghttp2, which contains the pkg-config
files.
(vala-0.52): Add older variant.
(libsoup-minimal-2): New variable.
(rest)[propagated-inputs]: Use libsoup-minimal-2.
(geoclue)[inputs]: Likewise.
* gnu/packages/inkscape.scm (inkscape)[inputs]: Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-11-11 12:18:15 -0500'>2021-11-11</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=50db3459cb20132a811b6b071545e76757ae8fa5'>gnu: inkscape: Remove the legacy 0.92 version.</a><span class='msg-avail'>...<span class='msg-tooltip'>The older 0.92 Inkscape package was previously kept because of problems
building lib2geom on the ARM architectures.  As this no longer appears to be a
problem (tested on the overdrive1 machine), finally replace the older Inkscape
by the newer 1.1 release.

* gnu/packages/inkscape.scm (inkscape-1.1): Delete variable, moving the
package definition to...
(inkscape): ... the now single inkscape variable.  Remove trailing #t.
[tests?]: Remove.
[phases]{generate-gdk-pixbuf-loaders-cache-file}: Add phase.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-11-03 14:27:51 +0200'>2021-11-03</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=075df3d3e2f86ad2548075969b34402a3c40ec42'>Merge remote-tracking branch 'origin/master' into core-updates-frozen</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-11-03 11:19:57 +0100'>2021-11-03</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=0489e488de350cd06b95fa9dc72ba71d2e6550a4'>gnu: inkscape@1.1: Update to 1.1.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/inkscape.scm (inkscape-1.1): Update to 1.1.1.
[source]: Remove patch.  Don't explicitly return #t from snippet.
[arguments]: Don't explicitly return #t from phases.
* gnu/packages/patches/inkscape-1.1-fix-build-witch-gcc7.5.patch:
Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-10-02 10:54:13 +0000'>2021-10-02</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=50e0fa19f0f6447e18ec7f49b961f011ff4d23f1'>gnu: Update gtkmm to 4.2.0, add gtkmm@3, and adjust gtkmm@2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gtk.scm (gtkmm)[version]: Update to 4.2.0.
[arguments](meson): New argument.
[native-inputs]: Add glib:bin.
[propagated-inputs]: Replace gtk+ with gtk.
(gtkmm-3): New variable.
(gtkmm-2)[arguments]: Strip certain inherited arguments.
* gnu/packages/animation.scm (synfigstudio)[inputs]: Switch to gtkmm-3.
* gnu/packages/astronomy.scm (stackistry)[inputs]: Ditto.
* gnu/packages/audio.scm (guitarix)[inputs]: Ditto.
* gnu/packages/disk.scm (parted)[inputs]: Ditto.
* gnu/packages/gnome.scm (gnome-system-monitor)[inputs]: Ditto.
(workrave)[inputs]: Ditto.
(gnote)[inputs]: Ditto.
* gnu/packages/gobby.scm (gobby)[inputs]: Ditto.
* gnu/packages/inkscape.scm (inkscape)[inputs]: Ditto.
* gnu/packages/mail.scm (astroid)[inputs]: Ditto.
* gnu/packages/mate.scm (mate-system-monitor)[inputs]: Ditto.
* gnu/packages/music.scm (tascam-gtk)[inputs]: Ditto.
* gnu/packages/photo.scm (rawtherapee)[inputs]: Ditto.
* gnu/packages/pulseaudio.scm (pavucontrol)[inputs]: Ditto.
(paprefs)[inputs]: Ditto.
* gnu/packages/text-editors.scm (jucipp)[inputs]: Ditto.
* gnu/packages/wm.scm (waybar)[inputs]: Ditto.
</span></span></td><td>Raghav Gururajan</td></tr>