languages: cmake: add file association pref for CMakeLists.txt
http://bugs.activestate.com/show_bug.cgi?id=102854

(integrated from komodo (trunk) change 84658 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14320 b87d16e7-d29f-4ee1-b5ec-817d645d335f