Improve system call support on NT

- Improve i/o perf on New Technology
- Code cleanup on read() for New Technology
- Fix bad bug with dup() of socket on New Technology
- Clean up some more strace errors on New Technology

libc/log/restoretty.c

@@ -50,8 +50,11 @@ const void *const g_oldtermios_ctor[] initarray = {
 };
 
 void __restore_tty(int fd) {
+  int e;
+  e = errno;
   if (g_oldtermios.c_lflag && !__nocolor && isatty(fd)) {
     write(fd, ANSI_RESTORE, strlen(ANSI_RESTORE));
     tcsetattr(fd, TCSAFLUSH, &g_oldtermios);
   }
+  errno = e;
 }