How to skip dg-module-cmi?

[Kito Cheng via Gcc]

Hi Nathan:

Recently I am clean up the failed case for bare-matel riscv64 target,
and that not support omp due to lack of pthread support (e.g.
gcc/testsuite/g++.dg/modules/omp-1_a), however even I add
`dg-require-effective-target pthread`, `dg-module-cmi` seems still try
to test and then get failed.

So is there a right way to skip `dg-module-cmi` testing?

Thanks :)