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/t4124-apply-ws-rule.sh

@@ -35,15 +35,9 @@ prepare_test_file () {
 }
 
 apply_patch () {
-	cmd_prefix= &&
-	if test "x$1" = 'x!'
-	then
-		cmd_prefix=test_must_fail &&
-		shift
-	fi &&
 	>target &&
 	sed -e "s|\([ab]\)/file|\1/target|" <patch |
-	$cmd_prefix git apply "$@"
+	git apply "$@"
 }
 
 test_fix () {
@@ -105,7 +99,7 @@ test_expect_success 'whitespace=warn, default rule' '
 
 test_expect_success 'whitespace=error-all, default rule' '
 
-	apply_patch ! --whitespace=error-all &&
+	test_must_fail apply_patch --whitespace=error-all &&
 	test_must_be_empty target
 
 '