Add LLVM/CLANG-3.2 toolchain

1. Download/build llvm-3.2 clang/llvm
2. New NDK_TOOLCHAIN_VERSION=clang3.2, or simply
   NDK_TOOLCHAIN_VERSION=clang to picks up the most recent
   version of clang/llvm (3.2 at this moment)
3. Add toolchain/*clang-3.2

Change-Id: I37d250addc17f6a2499982819c4952110be18394
10 files changed