Diff of /sys_win.h [56c6be] .. [324658] Maximize Restore

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--- a/sys_win.h
+++ b/sys_win.h
@@ -117,8 +117,13 @@
 
 typedef LPSTR *Handle;
 
+#ifdef _DLL
 extern HINSTANCE hDllInstance;
 extern HWND wndOwner;
+#else
+#define hDllInstance 0
+#define wndOwner 0
+#endif
 
 void SetWindowOwner(HWND Owner);
 void CenterDialog(HWND hDlg);