Fix tools_r10 build.

Fix tools_r10 build.

This is a back-port of https://review.source.android.com/#change,22179

Remove obsolete emulator modules

The corresponding modules have all been moved to development/tools/emulator/system/
already. Note that we use a global variable Make trick to prevent the same module
from being built twice, so removing these files doesn't break the builds.

Another patch should remove the global variable Make trick from
development/tools/emulator/system after this patch.

Change-Id: I52d7a0b13bf2115ed1f566dd968fac2093b3be35