Remove prototype that crept back in.

Change-Id: I93c4690d6f655d2b4e5121cee889d9143d49b9ed

src/server/gdb_server.c

@@ -112,8 +112,6 @@ static char *gdb_port_next;
 static void gdb_log_callback(void *priv, const char *file, unsigned line,
 		const char *function, const char *string);
 
-static void gdb_sig_halted(struct connection *connection);
-
 /* number of gdb connections, mainly to suppress gdb related debugging spam
  * in helper/log.c when no gdb connections are actually active */
 int gdb_actual_connections;