Merge pull request #479 from lurch/patch-1

Don't allow both ENDIANNESSes to be set

py/mpconfig.h

@@ -193,6 +193,10 @@ typedef double mp_float_t;
 // Just because most archs are such?
 #define MP_ENDIANNESS_LITTLE (1)
 #endif
+// Ensure we don't accidentally set both endiannesses
+#if MP_ENDIANNESS_BIG
+#define MP_ENDIANNESS_LITTLE (0)
+#endif
 
 // printf format spec to use for machine_int_t and friends
 #ifndef INT_FMT