Remove eaccelerator config from conf.xml

This project is long since unsupported.

Existing conf.php files with eaccelerator configs will continue to work ...
we just don't provide an explicit configuration option anymore.

horde/config/conf.xml

@@ -1052,20 +1052,6 @@
       cache entries."/>
      </configsection>
     </case>
-    <case name="Eaccelerator" desc="Use the eAccelerator cache (up to version
-    0.9.5)">
-     <configdescription>
-     eAccelerator must be built with --with-eaccelerator-shared-memory at
-     compile time to allow caching. &lt;strong&gt;WARNING:&lt;/strong&gt; The
-     cache functionality has been removed with eAccelerator version 0.9.6. If
-     you want to use the eAccelerator cache driver, you need version 0.9.5 or
-     lower.
-     </configdescription>
-     <configsection name="params">
-      <configstring name="prefix" required="false" desc="The prefix to use for
-      cache entries."/>
-     </configsection>
-    </case>
     <case name="File" desc="Store data in filesystem">
      <configsection name="params">
       <configstring name="dir" required="false" desc="The location to store the