MDL-15928 switched to zip PHP extensions in HEAD - adding to env test

admin/environment.xml

@@ -264,6 +264,11 @@
           <ON_ERROR message="ctyperequired" />
         </FEEDBACK>
       </PHP_EXTENSION>
+      <PHP_EXTENSION name="zip" level="required">
+        <FEEDBACK>
+          <ON_ERROR message="ziprequired" />
+        </FEEDBACK>
+      </PHP_EXTENSION>
     </PHP_EXTENSIONS>
     <CUSTOM_CHECKS>
       <CUSTOM_CHECK file="question/upgrade.php" function="question_check_no_rqp_questions" level="optional">

install/stringnames.txt

@@ -163,3 +163,4 @@ wrongzipfilename
 wwwroot
 wwwrooterror
 xmlrpcrecommended
+ziprequired

lang/en_utf8/admin.php

@@ -767,5 +767,6 @@ $string['webproxy'] = 'Web proxy';
 $string['webproxyinfo'] = 'Fill in following options if your Moodle server can not access internet directly. Internet access is required for download of environment data, language packs, RSS feeds, timezones, etc.<br /><em>PHP cURL extension is highly recommended.</em>';
 $string['xmlrpcrecommended'] = 'Installing the optional xmlrpc extension is useful for Moodle Networking functionality.';
 $string['xmlstrictheaders'] = 'XML strict headers';
+$string['ziprequired'] = 'The Zip PHP extension is now required by Moodle, info-ZIP binaries or PclZip library are not used anymore.';
 
 ?>