build: Remove android makefiles from upstream modules.

These makefiles don't really belong upstream since they contain specific
references to things in the mupen64plus-ae project (e.g. ae-bridge).

One less diff with upstream, one less need to fork.
glide: Use config file rather than makefile flags for polygon offset.
rice: Use config file rather than makefile flags for polygon offset.
gln64: Use config file rather than makefile flags for polygon offset.
assets: Add polygon offset settings to gln64.conf.
ae-bridge: Use config file rather than jni functions for polygon offset.
build: Remove obsolete flags from makefile.