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/cpp.h

@@ -28,6 +28,16 @@
 /* a Unicode-friendly version of wxSTRINGIZE_T */
 #define wxSTRINGIZE_T(x)            wxAPPLY_T(wxSTRINGIZE(x))
 
+/*
+    Special workarounds for compilers with broken "##" operator. For all the
+    other ones we can just use it directly.
+ */
+#ifdef wxCOMPILER_BROKEN_CONCAT_OPER
+    #define wxPREPEND_L(x)      L ## x
+    #define wxAPPEND_i64(x)     x ## i64
+    #define wxAPPEND_ui64(x)    x ## ui64
+#endif /* wxCOMPILER_BROKEN_CONCAT_OPER */
+
 /*
    Helper macros for wxMAKE_UNIQUE_NAME: normally this works by appending the
    current line number to the given identifier to reduce the probability of the