t/t7800-difftool.sh: Skip with prereq on no PERL
Change t/t7800-difftool.sh to to skip with the the three-arg prereq form of test_expect_success instead of bailing out. Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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