[PATCH] Eliminate dependency on MBeanServerImpl

This class is apparently going away, and not actually used by phoenix:

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/mx4j/mx4j/src/core/mx4j/server/Attic/MBeanServerImpl.java

This patch will change the build to look for a class that phoenix 
actually uses:

===================================================================
RCS file: /home/cvs/jakarta-avalon-phoenix/build.xml,v
retrieving revision 1.191
diff -u -r1.191 build.xml
--- build.xml   3 Dec 2002 23:17:06 -0000       1.191
+++ build.xml   27 Dec 2002 01:58:00 -0000
@@ -125,7 +125,7 @@

      <!-- Check requirements of environment -->
      <target name="check-mx4j">
-        <available property="mx4j.present" 
classname="mx4j.server.MBeanServerImpl">
+        <available property="mx4j.present" 
classname="mx4j.util.StandardMBeanProxy">
              <classpath refid="project.class.path"/>
          </available>
          <antcall target="check-mx4j2"/>