Undefine DrawText in qlineedit.cpp

There is a #define DrawText DrawTextW in winuser.h which is included
in windows.h so that the enum value in line 1981 is seen as DrawTextW
and thus is not a valid enum value on Windows.

Reviewed-by: Samuel
Reviewed-by: Lars Knoll

src/widgets/widgets/qlineedit.cpp

@@ -85,6 +85,9 @@
 #endif
 
 #include <limits.h>
+#ifdef DrawText
+#undef DrawText
+#endif
 
 QT_BEGIN_NAMESPACE