Remove easily-changed and prominent variable that toggled

community-server features.

Community server features should be fully integrated into 5.1, but
disabled by default.  We never toggle that they're disabled based
on the version number, in the 5.1 line and later.

configure.in

@@ -12,7 +12,6 @@ AC_CANONICAL_SYSTEM
 # in mysqlbinlog::check_master_version().
 AM_INIT_AUTOMAKE(mysql, 5.1.23-beta)
 AM_CONFIG_HEADER([include/config.h:config.h.in])
-is_this_community_tree=no
 
 PROTOCOL_VERSION=10
 DOT_FRM_VERSION=6
@@ -605,7 +604,7 @@ AC_ARG_ENABLE(community-features,
         [--enable-community-features], 
         [Enable additional features provided by the user community.]),
     [ ENABLE_COMMUNITY_FEATURES=$enableval ],
-    [ ENABLE_COMMUNITY_FEATURES=$is_this_community_tree ]
+    [ ENABLE_COMMUNITY_FEATURES=no ]
     )
 
 if test "$ENABLE_COMMUNITY_FEATURES" = "yes"