No real changes, just use const_cast<> instead of C casts.

Replace many comments indicating that the C cast used was really a
const_cast<> with the proper cast itself. There is no reason to not use it any
longer, all the supported compilers understand it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/file.cpp

@@ -415,8 +415,7 @@ wxFileOffset wxFile::Length() const
 
     wxFileOffset iRc = Tell();
     if ( iRc != wxInvalidOffset ) {
-        // have to use const_cast :-(
-        wxFileOffset iLen = ((wxFile *)this)->SeekEnd();
+        wxFileOffset iLen = const_cast<wxFile *>(this)->SeekEnd();
         if ( iLen != wxInvalidOffset ) {
             // restore old position
             if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) {