src/libpcp/src/config.c: tweak for posix_style()
src/libpcp/src/config.c: tweak for posix_style()

Not right yet for Windows ... but more info in the comment that
might help us get it right eventually.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp