add mingw globs for libtest (#1635)

[theAeon]

Definitely gonna need some help with the tests here but this should work if the code is lazy matching like i think it is.

Obviously the ideal here would be to do paired matching (either lib$X.dll.a + lib$X.dll or $x.lib + $x.dll) but i don't think the current logic is conducive to that?

Addresses #1635

edit: it is not lazy matching like i assumed, its lazy matching of all present globs. hm.

[theAeon]

I wonder if its easy to select which set is added based on the compiler in use?