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/raise.c

@@ -27,10 +27,6 @@
 #include "libc/thread/tls.h"
 #include "libc/thread/xnu.internal.h"
 
-static textwindows inline bool HasWorkingConsole(void) {
-  return !!(__ntconsolemode[0] | __ntconsolemode[1] | __ntconsolemode[2]);
-}
-
 static dontubsan void RaiseSigFpe(void) {
   volatile int x = 0;
   x = 1 / x;