Put finishing touches on turfwar http server

- Shutdown process now has optimal cancellation latency
- Fairer techniques for shedding connections under load
- We no longer need to call poll() which is now removed

libc/calls/g_sighandrvas.c

@@ -19,7 +19,5 @@
 #include "libc/calls/state.internal.h"
 #include "libc/thread/thread.h"
 
-// TODO(jart): These should be _Thread_local but doing that currently
-//             causes a regression with runitd.com on Windows.
 unsigned __sighandrvas[NSIG];
 unsigned __sighandflags[NSIG];