Build libclang.so with libclang tool

Scripts like bionic/libc/kernel/tools/cpp.py use libclang tool to parse
C/C++ files. Change the makefiles of clang to include the support
functions into libclang.so.

Bug: 19426389
Change-Id: Ide7d80cc43a043a92e0282586dc0e6f7d3d79ddb
7 files changed