message: Permit base$ in variants file (Not used ATM)
diff: "description": "Variant options",
  "additionalProperties": false,
  "patternProperties": {
  + "base\\$": {
  + "type": "object",
  + "description": "Base mix-in for all variants (Not implemented for CMake Tools)",
  + "additionalProperties": true
  + },
  "^\\w+$": {
  "type": "object",
  "properties": {
  