coin: Enable target-protoc for vcpkg-provided protobuf

This feature enables us to build protobuf with different host/target
triplets to lipo the result.

Fixes: QTBUG-145933
Change-Id: I1456c148686c27cecc6f1f2f5decdeb6f0a2304d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

coin/provisioning/common/shared/vcpkg/vcpkg-configuration.json

@@ -3,7 +3,7 @@
   "default-registry": {
     "kind": "git",
     "repository": "https://git.qt.io/qtbuildsystem/vcpkg",
-    "baseline": "9c5c2a0ab75aff5bcd08142525f6ff7f6f7ddeee"
+    "baseline": "69d76a39e959a55928eb01b206fd82ef1746ffb4"
   },
   "overlay-triplets": [ "./../triplets" ]
 }

coin/provisioning/common/shared/vcpkg/vcpkg.json

@@ -8,7 +8,15 @@
   ],
   "dependencies": [
     "openssl",
-    "protobuf",
+    {
+      "name": "protobuf",
+      "platform": "!osx"
+    },
+    {
+      "name": "protobuf",
+      "platform": "osx",
+      "features": [ "target-protoc" ]
+    },
     "grpc"
   ]
 }

coin/provisioning/common/shared/vcpkg_version.txt

@@ -1 +1 @@
-vcpkg_version=2025.09.17
+vcpkg_version=2025.09.17-qt01