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/stdio/getrandom.c

@@ -176,7 +176,7 @@ static ssize_t GetDevUrandom(char *p, size_t n) {
 ssize_t __getrandom(void *p, size_t n, unsigned f) {
   ssize_t rc;
   if (IsWindows()) {
-    if (_check_interrupts(kSigOpRestartable, 0)) {
+    if (_check_interrupts(kSigOpRestartable)) {
       return -1;
     }
     rc = RtlGenRandom(p, n) ? n : __winerr();