Split random number functions off io.c, so that they can be documented

separately.

sysdep/unix/Doc

@@ -1,4 +1,4 @@
 H UNIX system dependent parts
-S io.c
 S log.c
 S krt.c
+# io.c is documented under Resources

sysdep/unix/Modules

@@ -5,6 +5,7 @@ io.c
 unix.h
 endian.h
 config.Y
+random.c
 
 krt.c
 krt.h

sysdep/unix/io.c

@@ -28,20 +28,6 @@
 #include "lib/unix.h"
 #include "lib/sysio.h"
 
-/*
- *	Random Numbers
- */
-
-u32
-random_u32(void)
-{
-  long int rand_low, rand_high;
-
-  rand_low = random();
-  rand_high = random();
-  return (rand_low & 0xffff) | ((rand_high & 0xffff) << 16);
-}
-
 /*
  *	Tracked Files
  */

sysdep/unix/random.c

@@ -0,0 +1,21 @@
+/*
+ *	BIRD Internet Routing Daemon -- Random Numbers
+ *
+ *	(c) 2000 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <stdlib.h>
+
+#include "nest/bird.h"
+
+u32
+random_u32(void)
+{
+  long int rand_low, rand_high;
+
+  rand_low = random();
+  rand_high = random();
+  return (rand_low & 0xffff) | ((rand_high & 0xffff) << 16);
+}