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

test/libc/calls/getcwd_test.c

@@ -43,7 +43,7 @@ TEST(getcwd, testNullBuf_allocatesResult) {
 
 TEST(getcwd, testWindows_addsFunnyPrefix) {
   if (!IsWindows()) return;
-  char path[PATH_MAX + 1];
+  char path[PATH_MAX];
   ASSERT_NE(0, getcwd(path, sizeof(path)));
   EXPECT_STARTSWITH("//?/", path);
 }