Fix building on Windows.
Apparently MSYS2 pkg-config might not actually support Windows paths,
thereby causing link-config to sometimes fail on Windows.
Fortunately Windows doesn't have the dependency problems of linux,
so we don't actually need to use link-config on Windows.

Signed-off-by: Peter Atashian <retep998@gmail.com>
Merge pull request #7 from retep998/master

Fix building on Windows.