merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/contrib/credential/netrc/t-git-credential-netrc.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+(
+	cd ../../../t
+	test_description='git-credential-netrc'
+	. ./test-lib.sh
+
+	if ! test_have_prereq PERL; then
+		skip_all='skipping perl interface tests, perl not available'
+		test_done
+	fi
+
+	perl -MTest::More -e 0 2>/dev/null || {
+		skip_all="Perl Test::More unavailable, skipping test"
+		test_done
+	}
+
+	# set up test repository
+
+	test_expect_success \
+		'set up test repository' \
+		'git config --add gpg.program test.git-config-gpg'
+
+	# The external test will outputs its own plan
+	test_external_has_tap=1
+
+	export PERL5LIB="$GITPERLLIB"
+	test_external \
+		'git-credential-netrc' \
+		perl "$GIT_BUILD_DIR"/contrib/credential/netrc/test.pl
+
+	test_done
+)