Check ignore next warning comments in a warn() helper

lib/hacks/gradient.js

@@ -370,9 +370,10 @@ class Gradient extends Value {
             /^(calc|min|max|clamp)$/i.test(tokens[0].value)))
       ) {
         if (decl && result) {
-          decl.warn(
+          utils.warn(
             result,
-            'Gradient color hints are not supported by old WebKit'
+            'Gradient color hints are not supported by old WebKit',
+            { node: decl }
           )
         }
         return false