Cleanup Android build and provide better diagnostics
Cleanup Android build and provide better diagnostics

No longer need to set ANDROID if COMPILER_RT_TEST_TARGET_TRIPLE is
arm-linux-androideabi.

No need to set ANDROID_COMMON_FLAGS.  These flags are already in
CMAKE_CXX_FLAGS which are used in try_compile().

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@210053 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt