Bug #55547 InnoDB is not included when configuring by default

Added InnoDB to the 'default' plugin group, and modified 
the autoconf script so the 'default' group is actually 
built by default.
      
(i.e  ./configure.am == ./configure.am --with-plugins=default ,
instead of being ./configure.am --with-plugins=none )

config/ac-macros/plugins.m4

@@ -782,7 +782,7 @@ dnl   Emits shell script for checking configure arguments
 dnl   Arguments to this macro is default value for selected plugins
 
 AC_DEFUN([_MYSQL_CHECK_PLUGIN_ARGS],[
- __MYSQL_CHECK_PLUGIN_ARGS(m4_default([$1], [none]))
+ __MYSQL_CHECK_PLUGIN_ARGS(m4_default([$1], [default]))
 ])
 
 AC_DEFUN([__MYSQL_CHECK_PLUGIN_ARGS],[

configure.in

@@ -2606,7 +2606,7 @@ MYSQL_STORAGE_ENGINE(partition, partition, [Partition Support],
 
 dnl -- ndbcluster requires partition to be enabled
 
-MYSQL_CONFIGURE_PLUGINS([none])
+MYSQL_CONFIGURE_PLUGINS([default])
 
 # Only build client code?
 AC_ARG_WITH(server,

storage/innobase/plug.in

@@ -15,7 +15,7 @@
 #
 
 MYSQL_STORAGE_ENGINE(innobase, innodb, [InnoDB Storage Engine],
-        [Transactional Tables using InnoDB], [max,max-no-ndb])
+        [Transactional Tables using InnoDB], [default,max,max-no-ndb])
 MYSQL_PLUGIN_DIRECTORY(innobase, [storage/innobase])
 MYSQL_PLUGIN_STATIC(innobase,   [libinnobase.a])
 MYSQL_PLUGIN_DYNAMIC(innobase,  [ha_innodb.la])