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/intrin/asan.c

@@ -344,7 +344,7 @@ static void __asan_exit(void) {
   kprintf("your asan runtime needs\n"
           "\t__static_yoink(\"__die\");\n"
           "in order to show you backtraces\n");
-  _Exitr(99);
+  _Exit(99);
 }
 
 dontdiscard static __asan_die_f *__asan_die(void) {
@@ -1483,7 +1483,7 @@ void __asan_init(int argc, char **argv, char **envp, intptr_t *auxv) {
   if (!_cmpxchg(&once, false, true)) return;
   if (IsWindows() && NtGetVersion() < kNtVersionWindows10) {
     __write_str("error: asan binaries require windows10\r\n");
-    _Exitr(0); /* So `make MODE=dbg test` passes w/ Windows7 */
+    _Exit(0); /* So `make MODE=dbg test` passes w/ Windows7 */
   }
   REQUIRE(_mmi);
   REQUIRE(sys_mmap);