std::min not found error on VS2013.

[gregshasaliedown]

When compiling on VS2013, std::min isn't found in intermediate.cpp. Explicitly including the algorithm header fixes it.

[OgreTransporter]

• https://github.com/aras-p/hlsl2glslfork/pull/36
• https://github.com/aras-p/hlsl2glslfork/pull/50
• https://github.com/aras-p/hlsl2glslfork/pull/52
• https://github.com/aras-p/hlsl2glslfork/pull/57