Address windows build issue.

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 
 ## 1.17.0 - Unreleased
-- Remove JPM from the main Janet distribution. Instead, JPM must be installed 
+- Remove JPM from the main Janet distribution. Instead, JPM must be installed
   separately like any other package.
 - Fix issue with `ev/go` when called with an initial value and supervisor.
 - Add the C API functions `janet_vm_save` and `janet_vm_load` to allow

src/core/state.h

@@ -139,7 +139,7 @@ struct JanetVM {
     size_t listener_cap;
     size_t extra_listeners;
 #ifdef JANET_WINDOWS
-    HANDLE iocp;
+    void **iocp;
 #elif defined(JANET_EV_EPOLL)
     JanetHandle selfpipe[2];
     int epoll;