Hack fix for build failing on MinGW due to -include Precompiled.h option included multiple times for the generated Lua API .cpp files without a space in between.

CMake/Modules/Urho3D-CMake-common.cmake

@@ -554,7 +554,7 @@ macro (enable_pch HEADER_PATHNAME)
                 if (FILE MATCHES \\.cpp$)
                     get_property (NO_PCH SOURCE ${FILE} PROPERTY NO_PCH)
                     if (NOT NO_PCH)
-                        set_property (SOURCE ${FILE} APPEND_STRING PROPERTY COMPILE_FLAGS "-include ${HEADER_FILENAME}")
+                        set_property (SOURCE ${FILE} APPEND_STRING PROPERTY COMPILE_FLAGS " -include ${HEADER_FILENAME}")
                     endif ()
                 endif ()
             endforeach ()