Added a g_memmove replacement for platforms without memmove, where bcopy

Added a g_memmove replacement for platforms without memmove, where bcopy

1999-07-01  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in, acconfig.h, gutils.c: Added a g_memmove
	replacement for platforms without memmove, where bcopy can't
	handle overlapping copies and the corresponding checks, which is
	taken form the PERL Configure routine.

	* glib.h: Updated the commentary about g_memmove to be right and
	more GLib-like.

	* configure.in: Removed test for rand_r, as it isn't used anymore.