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/__sig2.c

@@ -26,6 +26,7 @@
 #include "libc/calls/struct/siginfo.h"
 #include "libc/calls/struct/sigset.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/intrin/weaken.h"
 #include "libc/macros.internal.h"
 #include "libc/nt/runtime.h"
 #include "libc/runtime/internal.h"
@@ -35,6 +36,7 @@
 #include "libc/sysv/consts/sig.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/thread/tls.h"
+
 #ifdef __x86_64__
 
 /**
@@ -179,8 +181,16 @@ textwindows bool __sig_handle(int sigops, int sig, int si_code,
   switch (__sighandrvas[sig]) {
     case (intptr_t)SIG_DFL:
       if (__sig_is_fatal(sig)) {
-        STRACE("terminating on %G", sig);
-        _restorewintty();
+        size_t len;
+        char name[16];
+        strsignal_r(sig, name);
+        len = strlen(name);
+        name[len++] = '\n';
+        WriteFile(GetStdHandle(kNtStdErrorHandle), name, len, 0, 0);
+        STRACE("terminating on %s", name);
+        if (_weaken(__restore_console_win32)) {
+          _weaken(__restore_console_win32)();
+        }
         ExitProcess(sig);
       }
       // fallthrough