[mlpack-git] [mlpack] Removed trailing underscores in header guards. Resolved issue #533 (#537)

[Falit Jain]

@rcurtin  .. I apologize for my unclear commit message .. I would change to make it more understandable.

I compiled my changes and ran `mlpack_allknn --version` and got the following output : 
`mlpack_allkfn: part of mlpack 2.0.x


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