otrx: include endian.h to make __BYTE_ORDER work with musl

Without this the condition
if __BYTE_ORDER == __BIG_ENDIAN
was always true.

Thanks Szabolcs.

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

SVN-Revision: 46105

package/utils/otrx/src/otrx.c

@@ -10,6 +10,7 @@
  */
 
 #include <byteswap.h>
+#include <endian.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>