Remove abs(float) function that clashes with std::abs(float) #8
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Depending on which C++ standard library headers have been included there
might an abs(float) function already declared in the global namespace,
so the definition in this file conflicts with it. This cause a build
failure with GCC 7, which conforms more closely to the C++ standard with
respect to overloads of abs.
Including and adding a using-declaration for std::abs ensures
that the standard std::abs(float) function is available. This solution
should be portable to all compilers.