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kern/posix: remove srandom()/random() code for entropy gathering, will always use /dev/[u]random

--- a/kern/posix.c

+++ b/kern/posix.c

@@ -162,18 +162,14 @@

 	pthread_mutex_unlock(&op->mutex);

 }

-int randfd;

+static int randfd;

 #undef open

 void

 randominit(void)

 {

-#ifdef USE_RANDOM

-	srandom(getpid()+fastticks(nil)+ticks());

-#else

 	if((randfd = open("/dev/urandom", OREAD)) < 0)

 	if((randfd = open("/dev/random", OREAD)) < 0)

 		panic("open /dev/random: %r");

-#endif

 }

 #undef read

@@ -180,19 +176,11 @@

 ulong

 randomread(void *v, ulong n)

 {

-#ifdef USE_RANDOM

-	int i;

-

-	for(i=0; i<n; i++)

-		((uchar*)v)[i] = random();

-	return n;

-#else

 	int m;

 	if((m = read(randfd, v, n)) != n)

 		panic("short read from /dev/random: %d but %d", n, m);

 	return m;

-#endif

 }

 #undef time