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upas/fs: remove read timeout via alarm(2) in pop3resp

The alarm note is not handled by upas/fs, so if and when it did fire,
the pop3 client process would terminate rendering the entire fs
unresponsive.

--- a/sys/src/cmd/upas/fs/pop3.c

+++ b/sys/src/cmd/upas/fs/pop3.c

@@ -89,14 +89,11 @@

 	char *s;

 	char *p;

-	alarm(60*1000);

 	if((s = Brdstr(&pop->bin, '\n', 0)) == nil){

 		close(pop->fd);

 		pop->fd = -1;

-		alarm(0);

 		return "unexpected eof";

 	}

-	alarm(0);

 	p = s + strlen(s) - 1;

 	while(p >= s && (*p == '\r' || *p == '\n'))