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/calls/writev-nt.c

@@ -21,9 +21,8 @@
 #include "libc/sock/internal.h"
 #include "libc/sysv/errfuns.h"
 
-textwindows ssize_t sys_writev_nt(struct Fd *fd, const struct iovec *iov,
-                                  int iovlen) {
-  switch (fd->kind) {
+textwindows ssize_t sys_writev_nt(int fd, const struct iovec *iov, int iovlen) {
+  switch (g_fds.p[fd].kind) {
     case kFdFile:
     case kFdConsole:
       return sys_write_nt(fd, iov, iovlen, -1);