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libauthsrv: import better passtodeskey() function (from drawterm)

--- a/sys/src/libauthsrv/passtokey.c

+++ b/sys/src/libauthsrv/passtokey.c

@@ -9,14 +9,14 @@

 	uchar buf[PASSWDLEN], *t;

 	int i, n;

-	n = strlen(p);

-	if(n >= PASSWDLEN)

-		n = PASSWDLEN-1;

 	memset(buf, ' ', 8);

-	t = buf;

-	strncpy((char*)t, p, n);

-	t[n] = 0;

+	n = strlen(p);

+	if(n >= sizeof(buf))

+		n = sizeof(buf)-1;

+	memmove(buf, p, n);

+	buf[n] = 0;

 	memset(key, 0, DESKEYLEN);

+	t = buf;

 	for(;;){

 		for(i = 0; i < DESKEYLEN; i++)

 			key[i] = (t[i] >> i) + (t[i+1] << (8 - (i+1)));