message: MSVC compile fix
diff: // See the LICENSE file for details.
  #include <cfloat>
  -#include <cmath>
  #include <visionaray/math/math.h>
  @@ -14,6 +13,10 @@ TEST(SIMD, Trans)
  {
  // TODO: valid range for aXXX functions
  +#ifndef M_PI
  +#define M_PI 3.14159265358979323846264338327950288
  +#endif
  +
  VSNRAY_ALIGN(64) float arr[] = {
  0.0f, M_PI/8, M_PI/4, M_PI/2,
  1.0f, M_PI*2, M_PI*3, M_PI*4,
  