[mod_cgi] add FDEVENT_IN upon CGI exit

add FDEVENT_IN in addition to FDEVENT_HUP when triggering
cgi_handle_fdevent() after the CGI process exits.

(This helps improve reliability when running tests under Cygwin)

src/mod_cgi.c

@@ -1038,7 +1038,7 @@ static handler_t cgi_waitpid_cb(server *srv, void *p_d, pid_t pid, int status) {
 
         if (hctx) {
             hctx->pid = -1;
-            cgi_handle_fdevent(srv, hctx, FDEVENT_HUP);
+            cgi_handle_fdevent(srv, hctx, FDEVENT_IN|FDEVENT_HUP);
         }
 
         return HANDLER_FINISHED;