Depend on a Cairo release with cairo_surface_set_device_scale()

We are checking for Cairo ≥ 1.12 and then do an additional check for the
existence of the cairo_surface_set_device_scale() function because there
were no stable releases of Cairo with it. Now that Cairo 1.14 is out, we
can simply bump up the dependency.

clutter/clutter-canvas.c

@@ -494,9 +494,7 @@ clutter_canvas_emit_draw (ClutterCanvas *self)
       mapped_buffer = FALSE;
     }
 
-#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
   cairo_surface_set_device_scale (surface, window_scale, window_scale);
-#endif
 
   self->priv->cr = cr = cairo_create (surface);
 

configure.ac

@@ -139,7 +139,7 @@ m4_define([glib_req_version],           [2.39.0])
 m4_define([cogl_req_version],           [1.17.5])
 m4_define([json_glib_req_version],      [0.12.0])
 m4_define([atk_req_version],            [2.5.3])
-m4_define([cairo_req_version],          [1.12.0])
+m4_define([cairo_req_version],          [1.14.0])
 m4_define([pango_req_version],          [1.30])
 m4_define([gi_req_version],             [1.39.0])
 m4_define([uprof_req_version],          [0.3])
@@ -822,18 +822,6 @@ AS_CASE([$enable_pixbuf],
 
 AM_CONDITIONAL([PIXBUF_TESTS], [test "x$pixbuf_tests" = "xyes"])
 
-# Check for cairo_set_device_scale, as we don't want to depend hard on
-# this until there is a stable release with it
-saved_CFLAGS="$CFLAGS"
-saved_LIBS="$LIBS"
-CAIRO_CFLAGS=`$PKG_CONFIG --cflags cairo`
-CAIRO_LIBS=`$PKG_CONFIG --libs cairo`
-CFLAGS="$CFLAGS $CAIRO_CFLAGS"
-LIBS="$CAIRO_LIBS $LIBS"
-AC_CHECK_FUNCS(cairo_surface_set_device_scale)
-LIBS="$saved_LIBS"
-CFLAGS="$saved_CFLAGS"
-
 dnl === Enable debug level ====================================================
 
 m4_define([debug_default], [m4_if(m4_eval(clutter_minor_version % 2), [1], [yes], [minimum])])