The parsing of link information coming from the compiler wrapper has been improved:

- Support MSVC /link argument separation properly and add support for potential VC++ link flags
- Rely on the global import/static/shared library suffixes instead of hardcoded special values.
This should improve compatibility with Cygwin and MinGW should any MPI implementation there need this behavior.
- Don't use ``find_library`` if the full path of a library is known anyways.