Disable custom SDL signal handlers

Request SDL not to replace the SIGINT and SIGTERM handlers, so that the
process is immediately terminated on Ctrl+C.

This avoids process hanging on Ctrl+C during network calls on
initialization.

Some of them accepted a timeout, but it was not used since
commit 9b056f5091 anymore.

app/src/scrcpy.c

@@ -113,16 +113,16 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
 
     SDL_bool ret = SDL_TRUE;
 
+    if (!SDL_SetHint(SDL_HINT_NO_SIGNAL_HANDLERS, "1")) {
+        LOGW("Cannot request to keep default signal handlers");
+    }
+
     if (!sdl_init_and_configure()) {
         ret = SDL_FALSE;
         goto finally_destroy_server;
     }
 
-    // SDL initialization replace the signal handler for SIGTERM, so Ctrl+C is
+    socket_t device_socket = server_connect_to(&server);
-    // managed by the event loop. This blocking call blocks the event loop, so
-    // timeout the connection not to block indefinitely in case of SIGTERM.
-#define SERVER_CONNECT_TIMEOUT_MS 2000
-    socket_t device_socket = server_connect_to(&server, SERVER_CONNECT_TIMEOUT_MS);
     if (device_socket == INVALID_SOCKET) {
         server_stop(&server);
         ret = SDL_FALSE;

app/src/server.c

@@ -195,7 +195,7 @@ SDL_bool server_start(struct server *server, const char *serial, Uint16 local_po
     return SDL_TRUE;
 }
 
-socket_t server_connect_to(struct server *server, Uint32 timeout_ms) {
+socket_t server_connect_to(struct server *server) {
     if (!server->tunnel_forward) {
         server->device_socket = net_accept(server->server_socket);
     } else {

app/src/server.h

@@ -34,7 +34,7 @@ SDL_bool server_start(struct server *server, const char *serial, Uint16 local_po
                       Uint16 max_size, Uint32 bit_rate);
 
 // block until the communication with the server is established
-socket_t server_connect_to(struct server *server, Uint32 timeout_ms);
+socket_t server_connect_to(struct server *server);
 
 // disconnect and kill the server process
 void server_stop(struct server *server);