test-many-klibcs: Add options to limit which configurations are tested

Testing all configurations takes quite a long time, so currently
I make local edits to limit which configurations are tested.

This is silly.  Add command-line options to do this.
1 file changed
tree: a7114ce7cf5422d2e9621a9a965924ccb392611f
  1. .gitignore
  2. newklibc
  3. test-many-klibcs