Make greenbean web server better

- Remove misguided __assert_disabled variable
- Change EPROCLIM to be EAGAIN on BSD distros
- Improve quality of greenbean with cancellations
- Fix thread race condition crash with file descriptors

libc/calls/raise.c

@@ -68,10 +68,6 @@ int raise(int sig) {
     rc = sys_tkill(gettid(), sig, 0);
   } else if (IsWindows() || IsMetal()) {
     if (IsWindows() && sig == SIGKILL) {
-      // TODO(jart): Isn't this implemented by __sig_raise()?
-      if (_weaken(__restore_console_win32)) {
-        _weaken(__restore_console_win32)();
-      }
       ExitProcess(sig);
     } else {
       rc = __sig_raise(sig, SI_TKILL);