[MiNT] timegm() on MiNT

[David Brownlee <abs@absd.org>]

	/usr/include/time.h provides a prototype for timegm() but
	it does not exist in libc. This breaks the configure script
	for bmake, because it finds timegm() missing, so defines its
	own, and the prototype it generates conflicts with the
	one in /usr/include/time.h.

	Am I missing something - is there a timegm() in another library?
	If not, would it be possible to comment out the definitions in
	time.h?

	Thanks