Wrong platform check for Xinerama support

[Noel Grandin]

The XINE check from here:

http://xine.cvs.sourceforge.net/viewvc/xine/xine-ui/configure.ac?revision=1.134&view=markup

looks like this:

dnl
dnl Checks for Xinerama extension
dnl
AC_ARG_ENABLE([xinerama],
    AS_HELP_STRING([--disable-xinerama], [Don't build support for 
xinerama (default: check)]))
if test "x$enable_xinerama" != "xno"; then
   PKG_CHECK_MODULES([XINERAMA], [xinerama], [ac_have_xinerama="yes"], [
     AC_CHECK_LIB(Xinerama, XineramaQueryExtension,
                XINERAMA_LIBS="-lXinerama"
                ac_have_xinerama="yes",,
                $X_LIBS $X_PRE_LIBS -lXext $X_EXTRA_LIBS)
   ])

   if test "x$ac_have_xinerama" = "xyes"; then
      X_PRE_LIBS="$X_PRE_LIBS $XINERAMA_LIBS"
      AC_DEFINE(HAVE_XINERAMA,,[Define this if you have libXinerama 
installed])
   fi
fi
AM_CONDITIONAL(HAVE_XINERAMA, test x$ac_have_xinerama = "xyes")

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