gstwebrtc-api: Patch webrtc-adapter to fix Safari behaviour

There's currently a Safari-side bug causing webrtc-adapter to be unable to correctly shim the empty-candidate scenario
which we're using. This patch is very much a workaround and should be removed as soon as Safari and/or webrtc-adapter
fixes this on their side.

https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/issues/439
webrtcHacks/adapter#1140

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1377>

net/webrtc/gstwebrtc-api/package.json

@@ -49,6 +49,7 @@
  "webpack-dev-server": "4.15.1"
  },
  "dependencies": {
+ "patch-package": "8.0.0",
  "webrtc-adapter": "8.2.3"
  },
  "scripts": {
@@ -59,6 +60,7 @@
  "make": "npm run check && npm run build && npm run docs",
  "test": "mocha --node-env=test --exit",
  "prepack": "npm run test && npm run make",
- "start": "webpack serve"
+ "start": "webpack serve",
+ "postinstall": "patch-package"
  }
 }

net/webrtc/gstwebrtc-api/patches/webrtc-adapter+8.2.3.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/webrtc-adapter/src/js/common_shim.js b/node_modules/webrtc-adapter/src/js/common_shim.js
+index 96d7c8e..063ea64 100644
+--- a/node_modules/webrtc-adapter/src/js/common_shim.js
++++ b/node_modules/webrtc-adapter/src/js/common_shim.js
+@@ -388,7 +388,7 @@ export function shimAddIceCandidateNullOrEmpty(window, browserDetails) {
+ }
+ const nativeAddIceCandidate =
+ window.RTCPeerConnection.prototype.addIceCandidate;
+- if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {
++ if (!nativeAddIceCandidate) {
+ return;
+ }
+ window.RTCPeerConnection.prototype.addIceCandidate =