removed dll export declaration for wxCStrData: it's unneeded because the class is fully inline and creates problems with mingw32 3.4.2 which wanrs about functions defined locally after being declared with dll linkage and then fails to link wxBase DLL

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45027 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/string.h

@@ -772,7 +772,7 @@ public:
 
 // Lightweight object returned by wxString::c_str() and implicitly convertible
 // to either const char* or const wchar_t*.
-class WXDLLIMPEXP_BASE wxCStrData
+class wxCStrData
 {
 private:
     // Ctors; for internal use by wxString and wxCStrData only