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='2018-08-09 02:17:25 +0200'>2018-08-09</span></td><td><a href='/guix/commit/gnu/packages/mingw.scm?id=5c0f11c29cfed59d82ab06d92d2348f0fde30eb8'>gnu: mingw-w64: Update to 5.0.4.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-12 04:57:52 +0100'>2018-03-12</span></td><td><a href='/guix/commit/gnu/packages/mingw.scm?id=5dacc645b8830d5f65a677bb23a2c93241b165fb'>gnu: mingw-w64: Update to 5.0.3.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-12 04:57:44 +0100'>2018-03-12</span></td><td><a href='/guix/commit/gnu/packages/mingw.scm?id=8aaba500713df6d0ccd806caff4f24f4c9fcce49'>gnu: mingw-w64: Fix home page and avoid further confusion.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>