wmaker: Marked args as unused for compiler in signal handlers

When the process receive a signal, a callback function is used, which
means having a fixed argument list for that application function.

It is then correct to not use the argument, so this patch adds the
appropriate stuff to avoid a false report from compiler.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

src/startup.c

@@ -201,6 +201,9 @@ static RETSIGTYPE buryChild(int foo)
 	int save_errno = errno;
 	sigset_t sigs;
 
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) foo;
+
 	sigfillset(&sigs);
 	/* Block signals so that NotifyDeadProcess() doesn't get fux0red */
 	sigprocmask(SIG_BLOCK, &sigs, NULL);