sysdep.h:stpcpy change caused build error in autotester

[Hans-Peter Nilsson]

> Date: Wed, 4 May 2005 19:59:08 -0400
> From: Daniel Jacobowitz <drow@false.org>

> You can strip the bit from Makefile.am too.  It looks OK, but I
> don't know what weird ramifications it might have on configure...

The most weird ramification is that I have to install yet
another automake version (have 1.9.3 as needed in some other
subdir, need 1.9.5) to remove the -D_USE_GNU.  Bah.

Any fallout from configuring with -D_USE_GNU just has to be
dealt with.

brgds, H-P