modesetting: Require sufficiently new libdrm

Bugzilla: https://bugs.freedesktop.org/93883Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>

configure.ac

@@ -2035,8 +2035,7 @@ if test "x$XORG" = xyes; then
 
 	if test "x$DRM" = xyes; then
 		dnl 2.4.46 is required for cursor hotspot support.
-		PKG_CHECK_EXISTS(libdrm >= 2.4.46)
-		XORG_DRIVER_MODESETTING=yes
+		PKG_CHECK_EXISTS(libdrm >= 2.4.46, XORG_DRIVER_MODESETTING=yes, XORG_DRIVER_MODESETTING=no)
 	fi
 
 	AC_SUBST([XORG_LIBS])