otrx: add extra compilation check before using __BYTE_ORDER

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 46106

package/utils/otrx/src/otrx.c

@@ -18,6 +18,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#if !defined(__BYTE_ORDER)
+#error "Unknown byte order"
+#endif
+
 #if __BYTE_ORDER == __BIG_ENDIAN
 #define cpu_to_le32(x)	bswap_32(x)
 #define le32_to_cpu(x)	bswap_32(x)