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/lseek.c

@@ -78,7 +78,7 @@
 int64_t lseek(int fd, int64_t offset, int whence) {
   int64_t rc;
   if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
-    rc = _weaken(__zipos_lseek)(
+    rc = _weaken(__zipos_seek)(
         (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, offset, whence);
   } else if (IsLinux() || IsXnu() || IsFreebsd() || IsOpenbsd()) {
     rc = sys_lseek(fd, offset, whence, 0);