Ogre3d regression about calypso

[Syniurge]

Hi Kelly,

I'm currently working on fixes for the Ogre3D demo, although I'm getting different errors. Some of them shall be pushed later tonight.

[Syniurge]

Okay I've fixed all the compilation issues but it doesn't link on my Ubuntu 15.10 system where everything is built against libstdc++ 5.2 because Clang doesn't know yet (and it's been like this for a while..) about GCC's [abi:cxx11] tags:

https://llvm.org/bugs/show_bug.cgi?id=23529

Ogre, OIS and their dependencies need to be compiled with GCC/libstdc++ 4.9 or with -D_GLIBCXX_USE_CXX11_ABI=0.

I'm dropping the issue until this gets solved in Clang.

[Syniurge]

The latest commits (d99cbb3, 4c52da2) usher in compatibility with the GCC 5.1+ ABI and bring back the Ogre3D demo on recent Linux distributions (it was never really gone but Ogre3D and its dependencies had to be recompiled with GCC 4.9).