Add big endian define (hack for Sun)

src/Backends/Rendering/Software.cpp

@@ -14,6 +14,10 @@
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 
+#ifndef __BYTE_ORDER__
+#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
+#endif
+
 typedef struct RenderBackend_Surface
 {
 	unsigned char *pixels;