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/t7417-submodule-path-url.sh

@@ -25,21 +25,4 @@ test_expect_success 'fsck rejects unprotected dash' '
 	grep gitmodulesPath err
 '
 
-test_expect_success MINGW 'submodule paths disallows trailing spaces' '
-	git init super &&
-	test_must_fail git -C super submodule add ../upstream "sub " &&
-
-	: add "sub", then rename "sub" to "sub ", the hard way &&
-	git -C super submodule add ../upstream sub &&
-	tree=$(git -C super write-tree) &&
-	git -C super ls-tree $tree >tree &&
-	sed "s/sub/sub /" <tree >tree.new &&
-	tree=$(git -C super mktree <tree.new) &&
-	commit=$(echo with space | git -C super commit-tree $tree) &&
-	git -C super update-ref refs/heads/master $commit &&
-
-	test_must_fail git clone --recurse-submodules super dst 2>err &&
-	test_i18ngrep "sub " err
-'
-
 test_done