cmake: add support for unity builds

Author: brakhane

WickedEngine/CMakeLists.txt

@@ -195,6 +195,15 @@ add_custom_command(
 		COMMAND ${CMAKE_COMMAND} -E create_symlink ${WICKED_ROOT_DIR}/WickedEngine/shaders ${CMAKE_CURRENT_BINARY_DIR}/shaders
 )
 
+set_property(SOURCE
+	wiAudio.cpp
+	wiPathQuery.cpp
+	wiPrimitive_BindLUA.cpp
+
+	PROPERTY SKIP_UNITY_BUILD_INCLUSION TRUE
+)
+set_property(TARGET FAudio PROPERTY UNITY_BUILD NO)
+set_property(TARGET LUA PROPERTY UNITY_BUILD NO)
 
 # OFFLINE SHADER COMPILER
 add_executable(offlineshadercompiler