[libsanitizer] configure+make: install include/sanitizer into Clang

When building Clang with compiler-rt, copy the contents of compiler-rt/include/sanitizer into lib/clang/3.4/include/sanitizer



git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@193515 91177308-0d34-0410-b5e6-96231b3b80d8