Merge branch 'jk/apache-test-for-2.4' into maint

Allow our tests to run with newer Apache.

* jk/apache-test-for-2.4:
  lib-httpd/apache.conf: check version only after mod_version loads
  t/lib-httpd/apache.conf: configure an MPM module for apache 2.4
  t/lib-httpd/apache.conf: load compat access module in apache 2.4
  t/lib-httpd/apache.conf: load extra auth modules in apache 2.4
  t/lib-httpd/apache.conf: do not use LockFile in apache >= 2.4

t/lib-httpd/apache.conf

@@ -1,5 +1,4 @@
 ServerName dummy
-LockFile accept.lock
 PidFile httpd.pid
 DocumentRoot www
 LogFormat "%h %l %u %t \"%r\" %>s %b" common
@@ -24,6 +23,10 @@ ErrorLog error.log
 	LoadModule version_module modules/mod_version.so
 </IfModule>
 
+<IfVersion < 2.4>
+LockFile accept.lock
+</IfVersion>
+
 <IfVersion < 2.1>
 <IfModule !mod_auth.c>
 	LoadModule auth_module modules/mod_auth.so
@@ -45,6 +48,21 @@ 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>
+<IfModule !mod_access_compat.c>
+	LoadModule access_compat_module modules/mod_access_compat.so
+</IfModule>
+<IfModule !mod_mpm_prefork.c>
+	LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
+</IfModule>
+</IfVersion>
+
 PassEnv GIT_VALGRIND
 PassEnv GIT_VALGRIND_OPTIONS