[clang][ExtractAPI] Add missing features for extract-api (swiftlang#9556)

Some features weren't cherry-picked properly and have since disappeared,
this change is for adding them back to features.json

rdar://139515136

Author: daniel-grumberg

clang/tools/driver/features.json

@@ -12,6 +12,9 @@
     {
       "name": "vfs-redirecting-with"
     },
+    {
+      "name": "extract-api-ignores"
+    },
     {
       "name": "depscan-prefix-map"
     },
@@ -34,6 +37,9 @@
     },
     {
       "name": "resource-dir-uses-major-version-only"
+    },
+    {
+      "name": "extract-api-supports-cpp"
     }
   ]
 }