[OpenMP][Cmake] Allowed OpenMP testing detect test compiler with same generator

Fix ninja build detect test compiler failed under windows.

Patch by Peiyuan Song

Differential Revision: https://reviews.llvm.org/D53479


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@351223 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed