Use correct extensions in wxDynamicLibrary::CanonicalizeName() on OS X.

Contrary to the documentation, this function incorrectly appended the
.bundle extension on OS X for libraries as well as modules.

Fixed to use .dylib for libraries (wxDL_LIBRARY) and continue to use
.bundle for loadable modules (wxDL_MODULE). Change GetDllExt() to take optional wxDynamicLibearyCategory argument.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74161 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dynlib.h

@@ -232,7 +232,7 @@ public:
     static wxDllType         GetProgramHandle();
 
     // return the platform standard DLL extension (with leading dot)
-    static const wxString& GetDllExt() { return ms_dllext; }
+    static wxString GetDllExt(wxDynamicLibraryCategory cat = wxDL_LIBRARY);
 
     wxDynamicLibrary() : m_handle(0) { }
     wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
@@ -372,9 +372,6 @@ protected:
 #endif // wxHAVE_DYNLIB_ERROR
 
 
-    // platform specific shared lib suffix.
-    static const wxString ms_dllext;
-
     // the handle to DLL or NULL
     wxDllType m_handle;