Merge branch 'jk/http-test-cgipassauth-unavailable-in-older-apache'

We started unconditionally testing with CGIPassAuth directive but
it is unavailable in older Apache that ships with CentOS 7 that has
about a year of shelf-life still left.  The test has conditionally
been disabled when running with an ancient Apache.  This was a fix
for a recent regression caught before the release, so no need to
mention it in the release notes.

* jk/http-test-cgipassauth-unavailable-in-older-apache:
  t/lib-httpd: make CGIPassAuth support conditional

t/t5563-simple-http-auth.sh

@@ -5,6 +5,12 @@ test_description='test http auth header and credential helper interop'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 
+enable_cgipassauth
+if ! test_have_prereq CGIPASSAUTH
+then
+	skip_all="no CGIPassAuth support"
+	test_done
+fi
 start_httpd
 
 test_expect_success 'setup_credential_helper' '