Make options

RSDK

RSDK_REVISION=1: Only supports Mania
RSDK_REVISION=2: Supports Mania Plus
RSDK_REVISION=3: Supports Origins and S1&2 for mobile. (executable is RSDKv5U)
RSDK_ONLY=1: Only build the engine (no Game.so)
AUTOBUILD=1: Disable the Plus DLC