configure check for Xrandr extension

[Alex Pasadyn]

When I originally submitted the patch to check for RandR during 
configuration, part of it looked like this:
> -
>    AC_CHECK_HEADERS(X11/extensions/Xrandr.h,
> -
>        [ dnl *** If X11/extensions/Xrandr.h exists...
> -
>            AC_CHECK_LIB(Xrandr, XRRSetScreenConfigAndRate,
> -
>              [ AC_DEFINE(HAVE_LIBXRANDR, 1, [Define if you have the Xrandr library])
> -
>                 X_PRE_LIBS="$X_PRE_LIBS -lXrandr -lXrender"
> -
>              ],,
> -
>              $X_LIBS -lXext -lX11 -lXrender $X_EXTRA_LIBS
> -
>            )
> -
>        ],
> -
>        AC_MSG_WARN([[Xrandr extension not found, Wine will be built without it]]),
> -
>        [#include <X11/Xlib.h>])
> -

But the version that made it into CVS did not include the -lXrender.  At 
least on my system, the check fails without that because the Xrandr 
library itself calls functions in Xrender.  Is there a better way to 
specify that dependency or was this unintentional?

Alex