gtk3: error: 'GTK_STATE_FLAG_CHECKED' was not declared in this scope

Seen with gtk3-3.10.9.

Change-Id: I0fc3f6187e270bb13d110bee7c817b5f48d4ce50
(cherry picked from commit a38f8c22)

vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx

@@ -890,7 +890,7 @@ bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, co
             renderType = RENDER_CHECK;
             nType = CTRL_CHECKBOX;
             if (nState & ControlState::PRESSED)
-                flags = (GtkStateFlags)(flags | GTK_STATE_FLAG_CHECKED);
+                flags = (GtkStateFlags)(flags | CHECKED);
             break;
         case PART_MENU_ITEM_RADIO_MARK:
             styleClass = GTK_STYLE_CLASS_RADIO;
@@ -898,7 +898,7 @@ bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, co
             renderType = RENDER_RADIO;
             nType = CTRL_RADIOBUTTON;
             if (nState & ControlState::PRESSED)
-                flags = (GtkStateFlags)(flags | GTK_STATE_FLAG_CHECKED);
+                flags = (GtkStateFlags)(flags | CHECKED);
             break;
         case PART_MENU_SEPARATOR:
             styleClass = GTK_STYLE_CLASS_SEPARATOR;