[driver][arm] add armv7 and thumb include and lib paths

Add a new test android-ndk-standalone.cpp
with new Android NDK release tree structure.
Detect armv7 sub architecture and thumb mode,
to add system include and link search paths.

Differential Revision: http://reviews.llvm.org/D20600



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@271427 91177308-0d34-0410-b5e6-96231b3b80d8