po/git.pot: don't check in result of "make pot"

Remove the "po/git.pot" file from being tracked, which started with dce37b66fb0 (l10n: initial git.pot for 1.7.10 upcoming release, 2012-02-13). The reason the po/git.pot started being checked in was because the po/*.po files were changed a schema where we'd generate them from a known-good snapshot of po/git.pot, instead of each translator running "make pot" themselves. This makes sense, but we don't need to carry this file in-tree just to achieve that aim, and doing so has resulted in a significant amount of "diff churn" since this method of doing it was introduced: $ git log -p --oneline -- po/git.pot|wc -l 553743 We can instead let l10n contributors to generate "po/git.pot" in runtime to update their own "po/XX.po", and the l10n coordinator can check pull requests using CI pipeline. This reverts to the schema introduced initially in cd5513a7168 (i18n: Makefile: "pot" target to extract messages marked for translation, 2011-02-22). The actual "git rm" of po/git.pot was in preceding commit to make this change easier to review, and to preempt the mailing list from blocking it due to it being too large. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>