Fix Makefile, which missed including a necessary library for compiling in the
0.5.0 release.

See https://github.com/jordansissel/xdotool/pull/81 for more information.

--- xdotool-3.20150503.1/Makefile	2014-10-20 13:05:34.000000000 -0700
+++ xdotool-3.20150503.1/Makefile	2016-02-05 14:44:18.652734272 -0800
@@ -28,7 +28,7 @@
 CFLAGS+=-g # TODO(sissel): Comment before release
 CFLAGS+=$(CPPFLAGS)
 
-DEFAULT_LIBS=-L/usr/X11R6/lib -L/usr/local/lib -lX11 -lXtst -lXinerama
+DEFAULT_LIBS=-L/usr/X11R6/lib -L/usr/local/lib -lX11 -lXtst -lXinerama -lxkbcommon
 DEFAULT_INC=-I/usr/X11R6/include -I/usr/local/include
 
 XDOTOOL_LIBS=$(shell pkg-config --libs x11 2> /dev/null || echo "$(DEFAULT_LIBS)")  $(shell sh platform.sh extralibs) selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
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<div class='path'>path: <a href='/guix/log/?id=1e347214352ea0dc39944f809b9bb041a77c02d3'>root</a>/<a href='/guix/log/Makefile.am?id=1e347214352ea0dc39944f809b9bb041a77c02d3'>Makefile.am</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/Makefile.am?id=1e347214352ea0dc39944f809b9bb041a77c02d3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-11-16 18:19:47 +0100'>2016-11-16</span></td><td><a href='/guix/commit/Makefile.am?id=94d92c7796a3dd50c27d532315f7d497ac99f08e'>daemon: Add "builtin:download" derivation builder.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-16 18:00:41 +0100'>2016-11-16</span></td><td><a href='/guix/commit/Makefile.am?id=17ab08bcf0ae27ec6a1f07766080ebfbea8837d9'>tests: Move HTTP server to (guix tests http).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-12 23:35:43 +0200'>2016-10-12</span></td><td><a href='/guix/commit/Makefile.am?id=69e7322fdccaf28aad644ffaf9dedb7f21327f49'>build: Make 'assert-no-store-file-names' effective.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-08 21:20:35 +0800'>2016-10-08</span></td><td><a href='/guix/commit/Makefile.am?id=a1b30f99a87b497ddc4ee5d6e50dc465ebb13f19'>build-system: Add asdf-build-system.</a><span class='msg-avail'>...</span></td><td>Andy Patterson</td></tr>
<tr><td><span title='2016-10-03 22:05:51 -0400'>2016-10-03</span></td><td><a href='/guix/commit/Makefile.am?id=1927839dcb7bb7be7d4c6d9d5b25679ce80a62de'>gnu: linux-libre: Update to 4.8.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2016-09-22 22:26:11 -0500'>2016-09-22</span></td><td><a href='/guix/commit/Makefile.am?id=cdf26f40b0e8cb969a880a53f8606663229e46ff'>build: clean-go: warn about stray .go files.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2016-09-07 16:08:20 +0200'>2016-09-07</span></td><td><a href='/guix/commit/Makefile.am?id=96dbc93089723cece1241e51c657f596adf6d3d5'>Add Zsh completion file.</a><span class='msg-avail'>...</span></td><td>Eric Le Bihan</td></tr>
<tr><td><span title='2016-09-05 00:06:47 +0200'>2016-09-05</span></td><td><a href='/guix/commit/Makefile.am?id=7ca87354db53fd1e1a7a3dfeddb9a598ea064bbe'>Add (guix modules).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>