HWND already typedef'ed on OS/2 with EMX.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16783 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/iodbc/isql.h

@@ -34,10 +34,11 @@
 #define EXPORT
 #define CALLBACK
 #define SQL_API				EXPORT CALLBACK
-
+#ifndef __EMX__
 typedef void *HWND;
 #endif
 #endif
+#endif
 
 typedef void *SQLHWND;