Fix compilation on static targets

hrt/impl/TextureType.hx

@@ -40,7 +40,7 @@ class Utils {
         if (getTextureType(value) == gradient) {
             var gradientData = ((value:Dynamic).data:GradientData);
             gradientData.interpolation = gradientData.interpolation != null ? gradientData.interpolation : Linear;
-            gradientData.colorMode = gradientData.colorMode != null ? gradientData.colorMode : 0;
+            gradientData.colorMode = (gradientData.colorMode:Dynamic) != null ? gradientData.colorMode : 0;
 
             return gradientData;
         }