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e86ccd7f - tests: Ignore the LINGUAS envvar in msgfmt-desktop-2

tests: Ignore the LINGUAS envvar in msgfmt-desktop-2 Reported by Lars Wendler at: <http://lists.gnu.org/archive/html/bug-gettext/2014-06/msg00002.html>. * msgfmt-desktop-2: Unset the LINGUAS envvar.