Members in LOCAL_WHOLE_STATIC_LIBRARIES should be force_loaded.

For Mac build, force_load the LOCAL_WHOLE_STATIC_LIBRARIES.

Mac has its custom linker. However, its linking rule for generating
shared libraries doesn’t take the LOCAL_WHOLE_STATIC_LIBRARIES
into consideration.

Change-Id: Ia6858bf6e2ebb334db8f3d0bdc71d7ecc0ef11c1