Add ld-path-driver-option to features.json

The `-ld-path` option was introduced on `main` in swiftlang/swift-driver#1442 and 5.10 in swiftlang/swift-driver#1442. SwiftPM needs to detect this flag to pass options to the driver correctly, and it's suitable to do this via `feature.json` instead of checking for the compiler version via other means.

Author: MaxDesiatov

lib/Option/features.json

@@ -35,6 +35,9 @@
     },
     {
       "name": "const-extract-complete-metadata"
+    },
+    {
+      "name": "ld-path-driver-option"
     }
   ]
 }