emulator: opengl: re-enable gralloc builds

This re-enables the build of the gralloc GLES emulation library.

This is only for experimentation / debugging purpose. GLES emulation
is still disabled by default in the emulator. Even if you force-enable
it by using the '-gpu on' flag, this module will not properly yet
and nothing will be displayed.

Change-Id: I8f0ca8805ed99037b011365d08507ca08bff5e75
2 files changed