t: use sane_unset instead of unset
Change several tests to use the sane_unset function introduced in v1.7.3.1-35-g00648ba0 instead of the built-in unset function. This fixes a failure I was having on t9130-git-svn-authors-file.sh on Solaris, and prevents several other issues from occurring. Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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