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/t5150-request-pull.sh

@@ -4,12 +4,6 @@ test_description='Test workflows involving pull request.'
 
 . ./test-lib.sh
 
-if ! test_have_prereq PERL
-then
-	skip_all='skipping request-pull tests, perl not available'
-	test_done
-fi
-
 test_expect_success 'setup' '
 
 	git init --bare upstream.git &&
@@ -150,6 +144,7 @@ test_expect_success 'pull request after push' '
 		git request-pull initial origin master:for-upstream >../request
 	) &&
 	sed -nf read-request.sed <request >digest &&
+	cat digest &&
 	{
 		read task &&
 		read repository &&
@@ -178,6 +173,7 @@ test_expect_success 'request asks HEAD to be pulled' '
 		git request-pull initial "$downstream_url" >../request
 	) &&
 	sed -nf read-request.sed <request >digest &&
+	cat digest &&
 	{
 		read task &&
 		read repository &&