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/t3601-rm-pathspec-file.sh

@@ -1,79 +0,0 @@
-#!/bin/sh
-
-test_description='rm --pathspec-from-file'
-
-. ./test-lib.sh
-
-test_tick
-
-test_expect_success setup '
-	echo A >fileA.t &&
-	echo B >fileB.t &&
-	echo C >fileC.t &&
-	echo D >fileD.t &&
-	git add fileA.t fileB.t fileC.t fileD.t &&
-	git commit -m "files" &&
-
-	git tag checkpoint
-'
-
-restore_checkpoint () {
-	git reset --hard checkpoint
-}
-
-verify_expect () {
-	git status --porcelain --untracked-files=no -- fileA.t fileB.t fileC.t fileD.t >actual &&
-	test_cmp expect actual
-}
-
-test_expect_success 'simplest' '
-	restore_checkpoint &&
-
-	cat >expect <<-\EOF &&
-	D  fileA.t
-	EOF
-
-	echo fileA.t | git rm --pathspec-from-file=- &&
-	verify_expect
-'
-
-test_expect_success '--pathspec-file-nul' '
-	restore_checkpoint &&
-
-	cat >expect <<-\EOF &&
-	D  fileA.t
-	D  fileB.t
-	EOF
-
-	printf "fileA.t\0fileB.t\0" | git rm --pathspec-from-file=- --pathspec-file-nul &&
-	verify_expect
-'
-
-test_expect_success 'only touches what was listed' '
-	restore_checkpoint &&
-
-	cat >expect <<-\EOF &&
-	D  fileB.t
-	D  fileC.t
-	EOF
-
-	printf "fileB.t\nfileC.t\n" | git rm --pathspec-from-file=- &&
-	verify_expect
-'
-
-test_expect_success 'error conditions' '
-	restore_checkpoint &&
-	echo fileA.t >list &&
-
-	test_must_fail git rm --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
-
-	test_must_fail git rm --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
-
-	>empty_list &&
-	test_must_fail git rm --pathspec-from-file=empty_list 2>err &&
-	test_i18ngrep -e "No pathspec was given. Which files should I remove?" err
-'
-
-test_done