Bug 1562555 Don't scale widget pixmaps on older than GTK 3.22, r=stransky

Pre GTK 3.22 releases does not show hidpi widget pixmaps correctly.

Differential Revision: https://phabricator.services.mozilla.com/D37724

--HG--
extra : moz-landing-system : lando

widget/gtk/nsNativeThemeGTK.cpp

@@ -867,8 +867,9 @@ static void DrawThemeWithCairo(gfxContext* aContext, DrawTarget* aDrawTarget,
   static auto sCairoSurfaceSetDeviceScalePtr =
       (void (*)(cairo_surface_t*, double, double))dlsym(
           RTLD_DEFAULT, "cairo_surface_set_device_scale");
-  bool useHiDPIWidgets =
-      (aScaleFactor != 1) && (sCairoSurfaceSetDeviceScalePtr != nullptr);
+  bool useHiDPIWidgets = (aScaleFactor != 1) &&
+                         (gtk_check_version(3, 22, 0) != nullptr) &&
+                         (sCairoSurfaceSetDeviceScalePtr != nullptr);
 
   Point drawOffsetScaled;
   Point drawOffsetOriginal;