missing <cmath> in camera.cpp

[bvanevery]

I'm on Windows 10. I imported the .sln to Visual Studio 2019. It did some automatic project conversions and let me use the most current SDK. When building the solution I get the following errors:

1>C:\devel\asteroids_d3d12\src\camera.cpp(91,24): error C2039: 'sin': is not a member of 'std'
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\vector(24): message : see declaration of 'std'
1>C:\devel\asteroids_d3d12\src\camera.cpp(91,46): error C2039: 'cos': is not a member of 'std'
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\vector(24): message : see declaration of 'std'
1>C:\devel\asteroids_d3d12\src\camera.cpp(92,24): error C2039: 'cos': is not a member of 'std'
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\vector(24): message : see declaration of 'std'
1>C:\devel\asteroids_d3d12\src\camera.cpp(93,24): error C2039: 'sin': is not a member of 'std'
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\vector(24): message : see declaration of 'std'
1>C:\devel\asteroids_d3d12\src\camera.cpp(93,46): error C2039: 'sin': is not a member of 'std'
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\vector(24): message : see declaration of 'std'

Adding
#include <cmath>
as the last header file, makes the problem go away. Build succeeds and the demo runs.

On a completely different Windows 10 machine, using Visual Studio 2017, I didn't need this. I don't know how clean that build environment is, or how many additional developer tools I've installed.

[JeffersonMontgomery-Intel]

Thank-you for the report! Fix added to master.