[cmake] don't use a too new function in lua_source() (broken builds).

cmake/utils.cmake

@@ -43,7 +43,8 @@ function(lua_source varname filename)
     set (tmpfile "${CMAKE_CURRENT_BINARY_DIR}/${filename}.new.c")
     set (dstfile "${CMAKE_CURRENT_BINARY_DIR}/${filename}.c")
     get_filename_component(module ${filename} NAME_WE)
-    get_filename_component(dstdir ${dstfile} DIRECTORY)
+    get_filename_component(_name ${dstfile} NAME)
+    string(REGEX REPLACE "${_name}$" "" dstdir ${dstfile})
     if (IS_DIRECTORY ${dstdir})
     else()
         file(MAKE_DIRECTORY ${dstdir})