[test] Remove an unintentional -x cl flag in an aarch64-windows test

This test was only intended to test compiling C, not OpenCL.

Differential Revision: https://reviews.llvm.org/D36363

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@310222 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed