please fix visual studio makefile

[Nickak2003]

in ogre references to cplusplus, visual studio has a bug/feature where this returns depreciated value - because the compiler is not actually fully compliant, and they don't intent to fix this until it is. https://developercommunity.visualstudio ... lus/139261
the solution is to add:
/Zc:cplusplus
to c++ options.
this causes it to return a sane value that will match the language settings!

[sercero]

Can you create a pull request?

[dark_sylinc]

I added https://github.com/OGRECave/ogre-next/pull/407

Once CI gives the good to go, it will be merged into master (3.0)