meson: drop the xcb-xrandr version requirement

autotools doesn't have any requirement. This fixes meson on Ubuntu 16.04.

Cc: 18.3 19.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
diff --git a/meson.build b/meson.build
index d975b0d..bfff862 100644
--- a/meson.build
+++ b/meson.build
@@ -1400,7 +1400,7 @@
     dep_xcb_xfixes = dependency('xcb-xfixes')
   endif
   if with_xlib_lease
-    dep_xcb_xrandr = dependency('xcb-randr', version : '>= 1.12')
+    dep_xcb_xrandr = dependency('xcb-randr')
     dep_xlib_xrandr = dependency('xrandr', version : '>= 1.3')
   endif
 endif