Fix arm and armhf test builds and unit_test runtime.

Generalized with the correct define (comment from SC).

.github/workflows/test.yml

@@ -32,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-#   - run: sudo apt-get install qemu binfmt-support qemu-user-static
-#   - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes 
-#   - run: make armhf
+    - run: sudo apt-get install qemu binfmt-support qemu-user-static
+    - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes 
+    - run: make armhf
   linux2:
     runs-on: ubuntu-latest
     steps:

test/unit_test.c

@@ -2205,7 +2205,7 @@ static void eh6(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   (void) c, (void) ev_data;
 }
 
-#if defined(__arm__) || defined(__riscv)
+#if (MG_ENABLE_SOCKET == 0)
 int send(int sock, const void *buf, size_t len, int flags);
 int send(int sock, const void *buf, size_t len, int flags) {
   (void) sock, (void) buf, (void) len, (void) flags;