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
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<tr><td><span title='2021-10-31 14:49:47 +0200'>2021-10-31</span></td><td><a href='/guix/commit/tests/guix-environment.sh?id=bc5155b952ae8bdbc56aded4d8d39768b4e2a7d4'>Merge remote-tracking branch 'origin/master' into core-updates-frozen</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-10-25 19:02:32 +0200'>2021-10-25</span></td><td><a href='/guix/commit/tests/guix-environment.sh?id=10208952eaf0834b9cdf341bc75463ed033af315'>environment: Add tests for '--profile'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to a643deac2de81755a1843a3b41dd53857678bebc.

* tests/guix-environment-container.sh, tests/guix-environment.sh: Add
tests for '--profile'.
</span></span></td><td>Ludovic Courtès</td></tr>