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/intrin/getenv.c

@@ -16,8 +16,11 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/calls/strace.internal.h"
 #include "libc/dce.h"
+#include "libc/errno.h"
+#include "libc/intrin/kprintf.h"
 #include "libc/runtime/runtime.h"
 
 forceinline int Identity(int c) {