fix windows not respecting --msvc-lib-dir, --kernel32-lib-dir

I believe this was a regression caused by
51a6ff18d454f4cb0faa0f1837df9f0c55a80b43

closes #927
96ebd8b23bAndrew Kelley committed on 4/17/2018, 2:33:34 AMparentc7cb5c3
1 file changedLine totals unavailable