When compiling for *-windows-msvc, find the native libc_installation and
add the lib dirs to lib_dirs, so that system libs can be found.

Previously, `version` and `ole32` were detected via the mingw.libExists logic,
even on .msvc, which was a false positive. This detection logic for mingw doesn't
find uuid.lib, which was the failure that triggered this bugfix.

Only build the issue_5825 test if the native target is x86_64-windows-msvc,
since it requires the .msvc abi.