Cmake tool builds disable by default.

CMakeLists.txt

@@ -27,4 +27,4 @@ add_subdirectory(samples)
 # gameplay encoder
 # A pre-compiled executable can be found in 'gameplay/bin'. Uncomment to build yourself.
 #add_subdirectory(tools/encoder)
-add_subdirectory(tools/luagen)
+#add_subdirectory(tools/luagen)