* xlat/iffflags.in (IFF_DYNAMIC): New constant, had been introduced
before the current git repository was conceived.
(IFF_LOWER_UP, IFF_DORMANT): New constants, introduced by Linux commit
v2.6.17-rc1~1175^2~206.
(IFF_ECHO): New constant, introduced by Linux commit
v2.6.25-rc1~1162^2~1415.