XCB: Handle new enum value in switch

The new enum value was introduced in f3612f39



Change-Id: I9ab5d8fba459408246e9a6f40c5c086af5abbf82
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

src/plugins/platforms/xcb/qxcbintegration.cpp

@@ -355,6 +355,7 @@ QVariant QXcbIntegration::styleHint(QPlatformIntegration::StyleHint hint) const
     case QPlatformIntegration::FontSmoothingGamma:
     case QPlatformIntegration::StartDragVelocity:
     case QPlatformIntegration::UseRtlExtensions:
+    case QPlatformIntegration::PasswordMaskCharacter:
         // TODO using various xcb, gnome or KDE settings
         break; // Not implemented, use defaults
     case QPlatformIntegration::ShowIsFullScreen: