Don't pass pdb flags while linking inside compiler tests (#614)

This causes intermittent build failures in the MSVC CI because of a race
with the default anti-virus that ships with Windows while writing the
.pdb file: https://ci.appveyor.com/project/jpakkane/meson/build/1.0.58

There's a separate fix for that in the works that will fix this in the
general case, but for compiler tests we don't need to generate the pdb
file at all. So, just fetch the CRT flag (/MDd) if needed instead.

This has the side-effect of making compiler tests that use self.links
and self.run faster.

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