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[libc] Fix exit()

The functions registered at atexit() must be called in reverse
order. This patch also protect against calling exit() from
some of the atexit handler.

--- a/libc/src/exit.c

+++ b/libc/src/exit.c

@@ -9,8 +9,13 @@

 exit(int status)

 {

 	void (**bp)(void);

+	int i;

-	for (bp = _atexitf; bp < &_atexitf[_ATEXIT_MAX] && *bp; ++bp)

-		(*bp)();

+	for (i = _ATEXIT_MAX-1; i >= 0; --i) {

+		if (bp = _atexit[i]) {

+			*_atexit[i] = NULL;

+			(*bp)();

+		}

+	}

 	_Exit(status);

 }