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/createfilemapping.c

@@ -43,10 +43,12 @@ textwindows int64_t CreateFileMapping(
                                      flProtect, dwMaximumSizeHigh,
                                      dwMaximumSizeLow, opt_lpName);
   if (!hHandle) __winerr();
+#if 1
   NTTRACE("CreateFileMapping(%ld, %s, %s, %'zu, %#hs) → %ld% m", opt_hFile,
           DescribeNtSecurityAttributes(opt_lpFileMappingAttributes),
           DescribeNtPageFlags(flProtect),
           (uint64_t)dwMaximumSizeHigh << 32 | dwMaximumSizeLow, opt_lpName,
           hHandle);
+#endif
   return hHandle;
 }