Fix retina rendering on OSX
This does not actually improve any graphics, but at least OSX native
GUI elements won't look pixellated any more.
file(GLOB FortSprites *L.png *R.png)
list(REMOVE_ITEM FortSprites *@2x.png)
list(REMOVE_ITEM FortSprites *-icon.png)
install(FILES
${FortSprites}
DESTINATION ${SHAREPATH}Data/Forts)