[bug-gettext] update-po always recreates address@hidden and address@hidden when --no-wrap is used

[Simon Sobisch]

The files that are recreated are enATboldquot* and enATquot*

As the bug persists (and only exists when these "languages" are in
LINGUAS and --no-wrap is used, removing one of them and the problem is
gone, too) I've applied the following workaround:
change Makevars and set DIST_DEPENDS_ON_UPDATE_PO to "no" - obvious side
effect: the files need to be updated manually before running make dist
(I don't know of a way to add a "run only on make dist but not during
make distcheck" rule).

Simon