server: add server_preinit which is called before config file is parsed.

This fixes the issue under native win32 of the socket interface not being
enabled (via WSAStartup) before init is called from a script.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

src/server/server.h

@@ -74,6 +74,7 @@ int add_service(char *name, enum connection_type type, unsigned short port,
 		input_handler_t in_handler, connection_closed_handler_t close_handler,
 		void *priv);
 
+int server_preinit(void);
 int server_init(struct command_context *cmd_ctx);
 int server_quit(void);