Make improvements

- Add rusage to redbean Lua API
- Add more redbean documentation
- Add pledge() to redbean Lua API
- Polyfill OpenBSD pledge() for Linux
- Increase PATH_MAX limit to 1024 characters
- Untrack sibling processes after fork() on Windows

libc/intrin/nomultics.c

@@ -25,3 +25,4 @@
  * @see kprintf(), vflogf(), linenoise()
  */
 char __replmode;
+char __replstderr;