configure.ac: Remove plugins that should have disappeared.

Original commit message from CVS:
* configure.ac:
Remove plugins that should have disappeared.

ChangeLog

+2005-08-30  Jan Schmidt  <thaytan@mad.scientist.com>
+
+	* configure.ac:
+	  Remove plugins that should have disappeared.
+
 2005-08-30  Jan Schmidt  <thaytan@mad.scientist.com>
 	* autogen.sh:

configure.ac

@@ -289,10 +289,6 @@ GST_PLUGINS_ALL="\
 		qtdemux \
 		realmedia \
 		silence \
-		udp     \
-		videobox \
-		wavenc \
-		wavparse \
 		mpegaudioparse \
                 "