remove indirect use of endian.h from public headers

building on commit 97d35a552e,
__BYTE_ORDER is now available wherever alltypes.h is included.
endian.h should not be used since, in the future, it will expose
identifiers that are not in the reserved namespace for the headers
which were previously using it.

include/sys/acct.h

@@ -6,7 +6,6 @@ extern "C" {
 #endif
 
 #include <features.h>
-#include <endian.h>
 #include <time.h>
 #include <stdint.h>