revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/t/t3418-rebase-continue.sh

@@ -120,20 +120,6 @@ test_expect_success REBASE_P 'rebase passes merge strategy options correctly' '
 	git rebase --continue
 '
 
-test_expect_success 'rebase -r passes merge strategy options correctly' '
-	rm -fr .git/rebase-* &&
-	git reset --hard commit-new-file-F3-on-topic-branch &&
-	test_commit merge-theirs &&
-	git reset --hard HEAD^ &&
-	test_commit some-other-commit &&
-	test_tick &&
-	git merge --no-ff merge-theirs &&
-	FAKE_LINES="1 3 edit 4 5 7 8 9" git rebase -i -f -r -m \
-		-s recursive --strategy-option=theirs HEAD~2 &&
-	test_commit force-change-ours &&
-	git rebase --continue
-'
-
 test_expect_success '--skip after failed fixup cleans commit message' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b with-conflicting-fixup &&