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/describetermios.c

@@ -120,10 +120,6 @@ const char *(DescribeTermios)(char buf[N], ssize_t rc, struct termios *tio) {
   append(", .c_lflag=%s",
          DescribeFlags(b128, 128, kLocal, ARRAYLEN(kLocal), "", tio->c_lflag));
 
-  append(", c_cc[VINTR]=%#o", tio->c_cc[VINTR]);
-  append(", c_cc[VERASE]=%#o", tio->c_cc[VERASE]);
-  append(", c_cc[VWERASE]=%#o", tio->c_cc[VWERASE]);
-
   append("}");
 
   return buf;