Fixed a couple of compiler warnings.

windows/win.c

@@ -1689,6 +1689,7 @@ HWND WINAPI GetDesktopWindow(void)
     if (pWndDesktop) return pWndDesktop->hwndSelf;
     ERR_(win)( "You need the -desktop option when running with native USER\n" );
     ExitProcess(1);
+    return 0;
 }
 
 

windows/x11drv/wineclipsrv.c

@@ -189,7 +189,7 @@ void TextOut(Window win, GC gc, char *pStr);
 void getGC(Window win, GC *gc);
 
 
-void main(int argc, char **argv)
+int main(int argc, char **argv)
 {
     XEvent event;