Remove core-junit/core-junit-static and revert to JUnit 4.10

Removes the core-junit/core-junit-static targets as they are no
no longer used, the core-junit-files variable and removes any
Android specific patches needed to maintain backwards
compatibility with the Android API.

Also, removes the Common.mk file which is no longer needed.

Bug: 30188076
Test: make checkbuild
Change-Id: I6212d15495574573890ae3fdf73fdba4374759d1