Avoid pango 1.50.12+ that breaks non-system font loading on Windows when fontconfig is not used.

Works around #7543 for developers but does not resolve it as the official Wesnoth Windows builds do not use MSVC or vcpkg.
Only necessary for 1.16 because 1.17+ uses fontconfig.

vcpkg.json

@@ -44,5 +44,11 @@
     "boost-ptr-container",
     "boost-spirit",
     "boost-test"
+  ],
+  "overrides": [
+    {
+      "name": "pango",
+      "version": "1.50.11"
+    }
   ]
 }