cleanup endian handling

- define __BIG_ENDIAN__ or __LITTLE_ENDIAN__ with cmake & scons.
- ENDIAN_ORDER is now a define rather than a global short.
- replace checks like this with single ifdef: #if defined(__sgi) || defined (__sparc) || defined (__sparc__) || defined (__PPC__) || defined (__ppc__) || defined (__hppa__) || defined (__BIG_ENDIAN__)
- remove BKE_endian.h which isn't used

CMakeLists.txt

@@ -105,6 +105,7 @@ set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/lib CACHE INTERNAL "" FORCE )
 
 get_blender_version()
 
+
 # Blender internal features
 option(WITH_BLENDER "Build blender (disable to build only the blender player)" ON)
 mark_as_advanced(WITH_BLENDER)
@@ -1150,6 +1151,18 @@ if(WITH_RAYOPTIMIZATION)
 	unset(_sse2)
 endif()
 
+
+# set the endian define
+include(TestBigEndian)
+test_big_endian(_SYSTEM_BIG_ENDIAN)
+if(_SYSTEM_BIG_ENDIAN)
+	add_definitions(-D__BIG_ENDIAN__)
+else()
+	add_definitions(-D__LITTLE_ENDIAN__)
+endif()
+unset(_SYSTEM_BIG_ENDIAN)
+
+
 if(WITH_IMAGE_OPENJPEG)
 	if(UNIX AND NOT APPLE)
 		# dealt with above