Honor trailing slash in rpmGlob()

Honor trailing slash in rpmGlob()

- Only return directories if a pattern contains a trailing slash.
  Use GLOB_ONLYDIR hint if available but as this is unreliable,
  we need to stat the paths to be sure.
- Hysterically enough, rpm bundles its own copy of glob() which does
  have GLOB_ONLYDIR but ATM it doesn't get build because HAVE_D_TYPE
  isn't defined outside glibc build environment which is where our glob
  originally came from...