Fix build with Borland C++ compiler.

Disable some parts of the code that this compiler had problems with. Add
parentheses to work around its bugs elsewhere.

Closes #12558.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66054 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/pen.h

@@ -148,6 +148,11 @@ extern WXDLLIMPEXP_DATA_CORE(wxPenList*)   wxThePenList;
 // compilers as it compares elements of different enums
 #if FUTURE_WXWIN_COMPATIBILITY_3_0
 
+// Unfortunately some compilers have ambiguity issues when enum comparisons are
+// overloaded so we have to disable the overloads in this case, see
+// wxCOMPILER_NO_OVERLOAD_ON_ENUM definition in wx/platform.h for more details.
+#ifndef wxCOMPILER_NO_OVERLOAD_ON_ENUM
+
 inline bool operator==(wxPenStyle s, wxDeprecatedGUIConstants t)
 {
     return static_cast<int>(s) == static_cast<int>(t);
@@ -158,6 +163,8 @@ inline bool operator!=(wxPenStyle s, wxDeprecatedGUIConstants t)
     return !(s == t);
 }
 
+#endif // wxCOMPILER_NO_OVERLOAD_ON_ENUM
+
 #endif // FUTURE_WXWIN_COMPATIBILITY_3_0
 
 #endif // _WX_PEN_H_BASE_