message: fix if for mixed clang/xlf openmp flags
diff: @@ -331,7 +331,8 @@ class Axom(CachedCMakePackage, CudaPackage, ROCmPackage):
  )
  )
  - if "clang" in self.compiler.cxx and "+openmp" in spec and "+fortran" in spec:
  + if "clang" in self.compiler.cxx and "+openmp" in spec and "+fortran" in spec and
  + ("xlf" in self.compiler.fc or "xlf" in self.compiler.f77):
  openmp_gen_exp = ( "$<$<NOT:$<COMPILE_LANGUAGE:Fortran>>:"
  "-fopenmp=libomp>;$<$<COMPILE_LANGUAGE:"
  "Fortran>:-qsmp=omp>")
  