```
C:\projects\mlpack\src\mlpack\core\math\lin_alg.cpp(233): error C2065:
'M_SQRT2': undeclared identifier
[C:\projects\mlpack\build\src\mlpack\mlpack.vcxproj]
```
That's our offending line, but it's strange because `<mlpack/prereqs.hpp>`
includes `<cmath>`.
http://stackoverflow.com/questions/6563810/m-pi-works-with-math-h-but-not-with-cmath-in-visual-studio
So, worth a shot is the explanation that something else is including `<cmath>`
before `_USE_MATH_DEFINES` is defined. A "shot in the dark" idea is to push
that `<cmath>` include and `_USE_MATH_DEFINES` definition in `prereqs.hpp` up
to be the first thing included. If you like, push a change like that and let's
see what AppVeyor thinks... :)
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