Guard posxi1e has_extended with HAS_EXTENDED_CHECK
Guard posxi1e has_extended with HAS_EXTENDED_CHECK

Thanks to James Lott for reporting the issue (seen on FreeBSD) and
suggesting the fix.

Signed-off-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>
Tested-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

tjanez/bup,gevaerts/bup,ToxicFrog/bup,tjanez/bup,tjanez/bup,gevaerts/bup,ToxicFrog/bup,gevaerts/bup,ToxicFrog/bup,ToxicFrog/bup,tjanez/bup,tjanez/bup,tjanez/bup,gevaerts/bup,gevaerts/bup,ToxicFrog/bup