Wrap mask utilities in a feature flag

Author: thecrypticace

packages/tailwindcss/src/feature-flags.ts

@@ -7,3 +7,4 @@ export const enableScripting = process.env.FEATURES_ENV !== 'stable'
 export const enableSourceInline = process.env.FEATURES_ENV !== 'stable'
 export const enableUserValid = process.env.FEATURES_ENV !== 'stable'
 export const enableWrapAnywhere = process.env.FEATURES_ENV !== 'stable'
+export const enableMaskUtilities = process.env.FEATURES_ENV !== 'stable'