sysdep.h:stpcpy change caused build error in autotester

[Hans-Peter Nilsson]

> Date: Wed, 4 May 2005 19:31:25 -0400
> From: Daniel Jacobowitz <drow@false.org>

> If the macro is in scope but the decl isn't, something's mighty wrong
> with system headers.  BFD is building with -D_GNU_SOURCE; did the
> configure check run with -D_GNU_SOURCE?

Oh I see what you meant now.
No such definition for the autoconf test says config.log.

brgds, H-P