configure.ac: add -Werror to default compiler options

[Marcus Meissner]

On Fri, Sep 19, 2008 at 04:35:45PM +0200, Alexandre Julliard wrote:
> "Dan Kegel" <dank at kegel.com> writes:
> 
> > Agreed, to an extent.   A user who is trying to compile with a really
> > whacky toolchain (say, a C compiler on an Amiga, a mainframe, or a wristwatch)
> > should expect some errors, and we should not try to avoid those if they reflect
> > real problems that need to be solved before wine can run properly.
> 
> You don't need a wacky toolchain. All you need is a slightly old gcc, or
> a platform that not everybody has access to, like Mac OS. I periodically

Or a newer gcc, or -O3, or -D_FORTIFY_SOURCE=2 (default in SUSE and Redhat)
etc etc.

If someone wants -Werror, he can always set CFLAGS for himself ;)

Ciao, Marcus