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/close.c

@@ -23,11 +23,12 @@
 #include "libc/calls/syscall-nt.internal.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
+#include "libc/intrin/kprintf.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
+#include "libc/runtime/zipos.internal.h"
 #include "libc/sock/syscall_fd.internal.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/runtime/zipos.internal.h"
 
 /**
  * Closes file descriptor.
@@ -59,6 +60,8 @@ int close(int fd) {
   if (fd < 0) {
     rc = ebadf();
   } else {
+    // helps guarantee stderr log gets duplicated before user closes
+    if (_weaken(kloghandle)) _weaken(kloghandle)();
     // for performance reasons we want to avoid holding __fds_lock()
     // while sys_close() is happening. this leaves the kernel / libc
     // having a temporarily inconsistent state. routines that obtain