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/read.c

@@ -46,9 +46,5 @@ ssize_t __zipos_read(struct ZiposHandle *h, const struct iovec *iov,
     memcpy(iov[i].iov_base, h->mem + y, b);
   }
   if (opt_offset == -1) h->pos = y;
-  ZTRACE("__zipos_read(%.*s, cap=%d, off=%d) -> %d",
-         ZIP_CFILE_NAMESIZE(__zipos_get()->map + h->cfile),
-         ZIP_CFILE_NAME(__zipos_get()->map + h->cfile), GetIovSize(iov, iovlen),
-         x, y - x);
   return y - x;
 }