circular link dependency: libmailutils.a and libmailbox.a

[Sam Roberts]

mu_argp.c, in particular, makes calls into libmailbox.a. This has
tended to work because those functions are in mutil.c, and mutil.c
tends to have been needed by something in mailbox/ before the
linker got to the libmailutils.a. But, its just lucky, and now
I'm unlucky.

Can we move mu_argp.c/h into mailbox/?

Sam

-- 
Sam Roberts <address@hidden> (Vivez sans temps mort!)