message: ifdef/endif typo fix
diff: #define MFEM_BLAS_HPP
  #include "../config/config.hpp"
  -/*#ifdef _WIN32
  -#define _USE_MATH_DEFINES
  -#include <cmath>*/
  +#ifdef _WIN32
  +//#define _USE_MATH_DEFINES
  +//#include <cmath>
  #define M_PI 3.14159265358979323846
  #endif
  