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='2019-05-03 17:47:30 +0200'>2019-05-03</span></td><td><a href='/guix/commit/po/packages/da.po?id=adb5506b2cfb47f696d66a03ede897e9bfa829bb'>nls: Update da translations.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-13 21:40:02 +0100'>2019-02-13</span></td><td><a href='/guix/commit/po/packages/da.po?id=d093f3e4a4dd155969499ac2dc5fdb069a611c75'>nls: Update 'da' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-06-18 23:19:51 +0200'>2018-06-18</span></td><td><a href='/guix/commit/po/packages/da.po?id=f202292217c0a5588d1c281014e9453ff0343c19'>nls: Update 'da' translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-23 13:36:58 -0400'>2017-05-23</span></td><td><a href='/guix/commit/po/packages/da.po?id=db375739dac31360f5ca945ff06edfd952595cc5'>nls: Update 'da' translation.</a></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-12-19 14:38:25 +0100'>2016-12-19</span></td><td><a href='/guix/commit/po/packages/da.po?id=42539a84097122ce7c78f397722cde9f97f9bcd1'>nls: Update 'da' package translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-12-04 21:41:50 +0100'>2016-12-04</span></td><td><a href='/guix/commit/po/packages/da.po?id=58786f55e52a08f6f7b66c8578ec99c8840e5311'>nls: Update 'da' package translation.</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2016-03-28 22:25:42 +0200'>2016-03-28</span></td><td><a href='/guix/commit/po/packages/da.po?id=c3cfb7e330032c51cdf26df9664327ea5a75e893'>nls: Update 'da' translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-11-01 22:24:20 +0100'>2015-11-01</span></td><td><a href='/guix/commit/po/packages/da.po?id=b8d2eda4a37a7e4c9fb529bd48899d87cefaf345'>nls: Add Danish translation for packages.</a></td><td>Ludovic Courtès</td></tr>