updated for version 7.3.870
Problem: Compiler warnings when using MingW 4.5.3.
Solution: Do not use MAKEINTRESOURCE. Adjust #if. (Ken Takata)
diff --git a/src/os_win32.h b/src/os_win32.h
index 71b7609..f672ea8 100644
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -204,7 +204,7 @@
/* Enable common dialogs input unicode from IME if posible. */
#ifdef FEAT_MBYTE
/* The variables are defined in os_win32.c. */
-extern LRESULT (WINAPI *pDispatchMessage)(LPMSG);
+extern LRESULT (WINAPI *pDispatchMessage)(CONST MSG *);
extern BOOL (WINAPI *pGetMessage)(LPMSG, HWND, UINT, UINT);
extern BOOL (WINAPI *pIsDialogMessage)(HWND, LPMSG);
extern BOOL (WINAPI *pPeekMessage)(LPMSG, HWND, UINT, UINT, UINT);