Add NDK 22 to macOS images (#2542)

* add env variables to docs, add extra ndk

* add new header 4

* rename variable

* add ndk to toolset as generic approach

* grep latest version

* install latest lts

* improve function

* rename function

images/macos/toolsets/toolset-10.14.json

@@ -212,7 +212,11 @@
         ],
         "additional-tools": [
             "cmdline-tools;latest"
-        ]
+        ],
+        "ndk": {
+            "lts": "21",
+            "latest": "22"
+        }
     },
     "powershellModules": [
         {