add -P flag to m4(1)

[Matthew Dillon]

:Here's a patch that will add the -P option to our m4.  Please let me know
:what you think.  This is needed to bring in the latest flex sources.
:
:http://www.theshell.com/~pavalos/wip/m4.patch
:
:Thanks,
:Peter

    Hmm.  Running the getopt loop twice is kinda a hack.  If you absolutely
    have to do it at least put getopt's control string in one place so it
    isn't duplicated.

					-Matt