CMAKE: make windowed apps a bundle on osx

Author: mgerhardy

cmake/macros.cmake

@@ -751,7 +751,7 @@ macro(cp_add_executable)
 				endif()
 			elseif (DARWIN OR IOS)
 				list(APPEND _EXE_SRCS ${PROJECT_BINARY_DIR}/Info.plist)
-				add_executable(${_EXE_TARGET} ${_EXE_SRCS} ${TARGET_ASSETS})
+				add_executable(${_EXE_TARGET} MACOSX_BUNDLE ${_EXE_SRCS} ${TARGET_ASSETS})
 				if (_EXE_TPS)
 					texturepacker(PROJECTNAME ${_EXE_TARGET} FILELIST ${_EXE_TPS})
 					textures(${_EXE_TARGET})