Remove install target for non-existant directory.

--- a/src/CMakeLists.txt	2015-09-13 20:52:28.517344327 +0200
+++ b/src/CMakeLists.txt	2015-09-13 20:53:04.842453987 +0200
@@ -122,12 +122,6 @@
 		DESTINATION
 			${CMAKE_INSTALL_PREFIX}/share/applications
 	)
-	install(
-		FILES
-			${MARS_SOURCE_DIR}/resources/mars
-		DESTINATION
-			${CMAKE_INSTALL_PREFIX}/share/menu
-	)
 
 else(UNIX)
 	# executable
 rowspan='2'><a href='/'><img src='https://git.koszko.org/cgit-static/cgit.png' alt='cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='776c700aafb380ffc72f10cc463c6dfeb35dd7c1'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>refs</a><a class='active' href='/guix/log/gnu/installer/proxy.scm'>log</a><a href='/guix/tree/gnu/installer/proxy.scm?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>tree</a><a href='/guix/commit/gnu/installer/proxy.scm?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>commit</a><a href='/guix/diff/gnu/installer/proxy.scm?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/installer/proxy.scm'>
<input type='hidden' name='id' value='776c700aafb380ffc72f10cc463c6dfeb35dd7c1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>root</a>/<a href='/guix/log/gnu?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>gnu</a>/<a href='/guix/log/gnu/installer?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>installer</a>/<a href='/guix/log/gnu/installer/proxy.scm?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1'>proxy.scm</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/gnu/installer/proxy.scm?id=776c700aafb380ffc72f10cc463c6dfeb35dd7c1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-11 21:37:07 +0100'>2020-12-11</span></td><td><a href='/guix/commit/gnu/installer/proxy.scm?id=8361817bf693742757b096468198626f297bb09e'>install: Discover local substitute servers.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/substitutes.scm: New file.
* gnu/installer/newt/substitutes.scm: New file.
* gnu/local.mk (INSTALLER_MODULES): Add them.
* po/guix/POTFILES.in: Add gnu/installer/newt/substitutes.scm.
* gnu/installer/proxy.scm (with-silent-shepherd): Move to ...
* gnu/installer/utils.scm: ... here.
* gnu/installer/record.scm (&lt;installer&gt;)[substitutes-page]: New field.
* gnu/installer/newt.scm (substitutes-page): New procedure,
(newt-installer): register it.
* gnu/installer.scm (installer-steps): Add "substitutes-page" step.
* gnu/system/install.scm (%installation-services): Add avahi-service-type and
enable substitute server discover in guix-service-type.
[&lt;name-service-switch&gt;]: Set it to %mdns-host-lookup-nss.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-04-08 10:24:02 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/installer/proxy.scm?id=ee0ad7803c82383ac1bced073d8670bc407797e7'>installer: Add proxy support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/proxy.scm: New file.
* gnu/local.mk (INSTALLER_MODULES): Add it.
* po/guix/POTFILES.in: Add it.
* gnu/installer/newt/parameters.scm (run-proxy-page): New procedure,
(run-parameters-page): add the previous procedure to the parameters menu.
</span></span></td><td>Mathieu Othacehe</td></tr>