Prevent absolutely ridiculous and silly linux behaviour to kill programs

* By default on linux some send() errors will kill the process instead of
  returning an error code.

renderdoc/os/posix/posix_network.cpp

@@ -167,7 +167,11 @@ bool Socket::SendDataBlocking(const void *buf, uint32_t length)
 
   while(sent < length)
   {
-    ssize_t ret = send((int)socket, src, length - sent, 0);
+    int flags = 0;
+#if ENABLED(RDOC_LINUX)
+    flags = MSG_NOSIGNAL;
+#endif
+    ssize_t ret = send((int)socket, src, length - sent, flags);
 
     if(ret <= 0)
     {