elfcheck: Add Android.mk auto-fix rewriter

This commit adds an Android.mk auto-fix rewriter for prebuilt ELF
checks.

This rewriter can add the missing LOCAL_SHARED_LIBRARIES, add the
missing LOCAL_MULTILIB, or add LOCAL_CHECK_ELF_FILES if there are fatal
errors.

Test: Run fix_android_mk_prebuilt.py on some Android.mk.
Change-Id: If7c9dbff8b57112d5be615d692005ae62cfb41b4
5 files changed