Compiling on OSX - small "patch"

[Benjamin Piwowarski]

Hi,

When the filesystem is case-sensitive, building LyX fails on mac: to make it 
work, just change Appkit to AppKit in src/support/CMakeLists.txt 
        target_link_libraries(support "objc" "-framework Appkit" "-framework 
CoreFoundation")
by
        target_link_libraries(support "objc" "-framework AppKit" "-framework 
CoreFoundation")

and everything works properly
Benjamin