Fix TARGET_GLOBAL_CLANG_FLAGS not filtering TARGET_GLOBAL_CPPFLAGS,
add -fforce-addr to CLANG_CONFIG_UNKNOWN_CFLAGS, and remove duplicate rule.

Change-Id: I38ae521882537df4cc4627fe1ca7145e7dc9a31b
MY FLAGS

Change-Id: I3ed147f180267db975ee556a4730c2c1dad2d554