Squashed 'external/toxcore/c-toxcore/' changes from adbd5b32d8..e29e185c03

e29e185c03 feat: add ngc events
2b0dc0f46b add ngc related unpack functions
b2315c50e0 Add groupchat API function that returns an IP address string for a peer
5f863a5492 feat: Add `to_string` functions for all public enums.
0c998a7598 add real timeout test
68c827609a chore: Move s390x build to post-merge.
028b017d79 perf: Slightly reduce bandwidth usage when there are few nodes.
90f7496819 feat: Enable ubsan on bootstrap nodes.
89b6450d66 test: Add check-c run to bazel build.
REVERT: adbd5b32d8 feat: add ngc events

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: e29e185c03fea7337036e5ef4d1d9080a6cee721

.github/workflows/ci.yml

@@ -90,16 +90,6 @@ jobs:
         with:
           file: other/docker/compcert/Dockerfile
 
-  build-alpine-s390x:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      - name: Docker Build
-        uses: docker/build-push-action@v2
-        with:
-          file: other/docker/alpine-s390x/Dockerfile
-
   cimplefmt:
     runs-on: ubuntu-latest
     steps:

.github/workflows/post-submit.yml

@@ -0,0 +1,16 @@
+name: post-submit
+
+on:
+  push:
+    branches: [master]
+
+jobs:
+  build-alpine-s390x:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Docker Build
+        uses: docker/build-push-action@v2
+        with:
+          file: other/docker/alpine-s390x/Dockerfile