Determines the PKGLIBDIR equivalent under win32. Requires pgsql lib and

Determines the PKGLIBDIR equivalent under win32. Requires pgsql lib and
bin directories to be packaged under the same root directory (eg. <some
path>/pgsql/bin and <some path>/pgsql/lib) for the win32 port, which
does not appear to be an onerous restriction.

Claudio Natoli