Remove unused defines for MSVC which is not used in the case of haproxy,
and remove math.h which is not used as well.
// SOFTWARE.
#include <float.h>
-#include <math.h>
#include <import/mjson.h>
-#if defined(_MSC_VER)
-#define alloca(x) _alloca(x)
-#endif
-
-#if defined(_MSC_VER) && _MSC_VER < 1700
-#define va_copy(x, y) (x) = (y)
-#define isinf(x) !_finite(x)
-#define isnan(x) _isnan(x)
-#endif
-
static double mystrtod(const char *str, char **end);
static int mjson_esc(int c, int esc) {