automake: make update-po with different gettext versions

[Felix Natter]

Dear gettext developers,

I am assuming that - like on the bug-gtypist mailing list - we can post
here even if the discussion topic may not be a bug.

In this commit on gtypist, I changed src/infoview.c and ran "make
update-po" (which of course calls gettext) with gettext 0.21:
  
https://git.savannah.gnu.org/cgit/gtypist.git/commit/?id=d307025b680011a706299348df08aeb3ef52f615

One of the changes is this:

-"manual (at http://www.gnu.org/software/gtypist/doc/, or type \"info gtypist"
-"\")\n"
+"manual (at http://www.gnu.org/software/gtypist/doc/, or type \"info "
+"gtypist\")\n"


Now Mihai, the maintainer of the project, also ran this (through
./autogen.sh and with gettext ~= 0.18) and this generated lots of
formatting changes:
  
https://git.savannah.gnu.org/cgit/gtypist.git/commit/?id=5a5200c30958dafc8133ccd420898838d1021473

which undoes "my" formatting change:

-"manual (at http://www.gnu.org/software/gtypist/doc/, or type \"info "
-"gtypist\")\n"
+"manual (at http://www.gnu.org/software/gtypist/doc/, or type \"info gtypist"
+"\")\n"

If I am right and different gettext versions have different line
lengths, how can we avoid this? Hack automake to use "msgmerge --width
80"?

Many Thanks and Best Regards,
Felix
-- 
Felix Natter