Fix test/Driver/cl-options.c test

The test builds an object file to be able to get into linking mode
with a valid obj file on the command-line. Using clang-cl for this,
which targets win32, caused problems on some buildbots, so just
use regular clang.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190829 91177308-0d34-0410-b5e6-96231b3b80d8