Polish recent changes and make improvements

- Simulate SIGPIPE on Windows NT
- Fix commandv() regression on Windows NT
- Fix sigprocmask() strace bug on OpenBSD
- Add many more system calls to --strace logging
- Make errno state more pristine in redbean strace

libc/zipos/notat.c

@@ -25,7 +25,6 @@ int __zipos_notat(int dirfd, const char *path) {
   struct ZiposUri zipname;
   if (!path) return efault();
   if (__isfdkind(dirfd, kFdZip) || __zipos_parseuri(path, &zipname) != -1) {
-    ZTRACE("__zipos_notat(%d, %s) → EINVAL", dirfd, path);
     return einval();
   }
   return 0;