Make improvements for Actually Portable Emacs

- Get SIGWINCH working again on the New Technology
- Correctly handle O_NOFOLLOW in open() on Windows
- Implement synthetic umask() functionality on Windows
- Do a better job managing file execute access on Windows
- Fill in `st_uid` and `st_gid` with username hash on Windows
- Munge UNICODE control pictures into control codes on Windows
- Do a better job ensuring Windows console settings are restored
- Introduce KPRINTF_LOG environment variable to log kprintf to a file

libc/calls/sigsuspend.c

@@ -77,7 +77,7 @@ int sigsuspend(const sigset_t *ignore) {
       long totoms = 0;
 #endif
       do {
-        if ((rc = _check_interrupts(0, g_fds.p))) {
+        if ((rc = _check_interrupts(0))) {
           break;
         }
         if (SleepEx(__SIG_POLLING_INTERVAL_MS, true) == kNtWaitIoCompletion) {