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/t5607-clone-bundle.sh

@@ -64,7 +64,7 @@ test_expect_success 'ridiculously long subject in boundary' '
 	test -s heads &&
 	git fetch long-subject-bundle.bdl &&
 	sed -n "/^-/{p;q;}" long-subject-bundle.bdl >boundary &&
-	grep "^-$OID_REGEX " boundary
+	grep "^-[0-9a-f]\\{40\\} " boundary
 '
 
 test_expect_success 'prerequisites with an empty commit message' '
@@ -83,15 +83,4 @@ test_expect_success 'failed bundle creation does not leave cruft' '
 	test_path_is_missing fail.bundle.lock
 '
 
-test_expect_success 'fetch SHA-1 from bundle' '
-	test_create_repo foo &&
-	test_commit -C foo x &&
-	git -C foo bundle create tip.bundle -1 master &&
-	git -C foo rev-parse HEAD >hash &&
-
-	# Exercise to ensure that fetching a SHA-1 from a bundle works with no
-	# errors
-	git fetch --no-tags foo/tip.bundle "$(cat hash)"
-'
-
 test_done