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/runtime/findcombinary.c

@@ -24,7 +24,7 @@
 struct FindComBinary {
   bool once;
   const char *res;
-  char buf[PATH_MAX + 1];
+  char buf[PATH_MAX];
 };
 
 static struct FindComBinary g_findcombinary;