Modify abcc to support new bitcode wrapper.

Change-Id: Id9354781341a1f3721910073a7ffce62467502c3
Generate empty archive using ar.

Change-Id: I5f5bb74a0a9121de6808dad260e199b55497d876
Add -Wl,-link-native-binary.

Change-Id: Ia7bdceafa17b794823f6f60a8ba97492f3f79ce4

Conflicts:
	toolchains/llvm-3.3/setup.mk