Execute adb start-server

This does nothing if the adb daemon is already started, but allows to
print any output/errors to the console.

Otherwise, the daemon starting would occur during `adb devices`, which
does not output to the console because the result is parsed.

PR #3005 <https://github.com/Genymobile/scrcpy/pull/3005>

app/src/adb/adb.c

@@ -194,6 +194,14 @@ sc_adb_execute(const char *const argv[], unsigned flags) {
     return sc_adb_execute_p(argv, flags, NULL);
 }
 
+bool
+sc_adb_start_server(struct sc_intr *intr, unsigned flags) {
+    const char *const argv[] = SC_ADB_COMMAND("start-server");
+
+    sc_pid pid = sc_adb_execute(argv, flags);
+    return process_check_success_intr(intr, pid, "adb start-server", flags);
+}
+
 bool
 sc_adb_forward(struct sc_intr *intr, const char *serial, uint16_t local_port,
                const char *device_socket_name, unsigned flags) {