t/lib-httpd/apache.conf: load extra auth modules in apache 2.4

In apache 2.4, the "Auth*" and "Require" directives have
moved into the authn_core and authz_core modules,
respectively.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/lib-httpd/apache.conf

@@ -47,6 +47,15 @@ ErrorLog error.log
 </IfModule>
 </IfVersion>
 
+<IfVersion >= 2.4>
+<IfModule !mod_authn_core.c>
+	LoadModule authn_core_module modules/mod_authn_core.so
+</IfModule>
+<IfModule !mod_authz_core.c>
+	LoadModule authz_core_module modules/mod_authz_core.so
+</IfModule>
+</IfVersion>
+
 PassEnv GIT_VALGRIND
 PassEnv GIT_VALGRIND_OPTIONS