Defines M_PI, M_SQRT2 and finite() in bytecode...

... Which are not in standard C/C++ (otherwise compilation of the mex for Octave
with -std=c++11 fails).

mex/sources/bytecode/ErrorHandling.hh

@@ -143,6 +143,19 @@ class MSVCpp_missings
 };
 #endif
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#define M_SQRT2 1.41421356237309504880
+#define finite(x) !std::isfinite(x)
+#endif
 
 //#define DEBUG
 using namespace std;