remove redundant declarations

storage/blackhole/plug.in

 MYSQL_STORAGE_ENGINE(blackhole,,[Blackhole Storage Engine],
         [Basic Write-only Read-never tables], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(blackhole, [storage/blackhole])
 MYSQL_PLUGIN_STATIC(blackhole,  [libblackhole.la])
 MYSQL_PLUGIN_DYNAMIC(blackhole, [ha_blackhole.la])
 

storage/csv/plug.in

 MYSQL_STORAGE_ENGINE(csv,,      [CSV Storage Engine],
         [Stores tables in text CSV format])
-MYSQL_PLUGIN_DIRECTORY(csv,     [storage/csv])
 MYSQL_PLUGIN_STATIC(csv,        [libcsv.la])
 MYSQL_PLUGIN_MANDATORY(csv)     dnl Used for logging

storage/heap/plug.in

 MYSQL_STORAGE_ENGINE(heap,no,   [Memory Storage Engine],
         [Volatile memory based tables])
-MYSQL_PLUGIN_DIRECTORY(heap,    [storage/heap])
 MYSQL_PLUGIN_STATIC(heap,       [libheap_s.la], [libheap_embedded.la])
 MYSQL_PLUGIN_MANDATORY(heap)    dnl Memory tables
 

storage/innobase/plug.in.disabled

 MYSQL_STORAGE_ENGINE(innobase, innodb, [InnoDB Storage Engine],
         [Transactional Tables using InnoDB], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(innobase, [storage/innobase])
 MYSQL_PLUGIN_STATIC(innobase,   [libinnobase.la])
 MYSQL_PLUGIN_DYNAMIC(innobase,  [ha_innodb.la])
 MYSQL_PLUGIN_ACTIONS(innobase,  [

storage/innodb_plugin/plug.in

@@ -16,7 +16,6 @@
 
 MYSQL_STORAGE_ENGINE(innodb_plugin,, [InnoDB Storage Engine],
         [Transactional Tables using InnoDB], [])
-MYSQL_PLUGIN_DIRECTORY(innodb_plugin, [storage/innodb_plugin])
 # Enable if you know what you are doing (trying to link both InnoDB and
 # InnoDB Plugin statically into MySQL does not work).
 #MYSQL_PLUGIN_STATIC(innodb_plugin, [libinnobase.a])

storage/maria/plug.in

 MYSQL_STORAGE_ENGINE(maria,, [Maria Storage Engine],
         [Crash-safe tables with MyISAM heritage], [default,max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(maria,  [storage/maria])
 MYSQL_PLUGIN_STATIC(maria,     [libmaria_s.la], [libmaria_embedded.la])
 # Maria will probably go first into max builds, not all builds,
 # so we don't declare it mandatory.

storage/myisam/plug.in

 dnl MYSQL_STORAGE_ENGINE(myisam,no, [MyISAM Storage Engine],
 dnl         [Traditional non-transactional MySQL tables])
-dnl MYSQL_PLUGIN_DIRECTORY(myisam,  [storage/myisam])
 dnl MYSQL_PLUGIN_STATIC(myisam,     [libmyisam_s.la], [libmyisam_embedded.la])
 dnl MYSQL_PLUGIN_MANDATORY(myisam)  dnl Default
 

storage/myisammrg/plug.in

 MYSQL_STORAGE_ENGINE(myisammrg,no,[MyISAM MERGE Engine],
         [Merge multiple MySQL tables into one])
-MYSQL_PLUGIN_DIRECTORY(myisammrg,[storage/myisammrg])
 MYSQL_PLUGIN_STATIC(myisammrg,  [libmyisammrg_s.la], [libmyisammrg_embedded.la])
 MYSQL_PLUGIN_MANDATORY(myisammrg)

storage/ndb/plug.in

 MYSQL_STORAGE_ENGINE(ndbcluster, ndbcluster, [Cluster Storage Engine],
         [High Availability Clustered tables],)
-MYSQL_PLUGIN_DIRECTORY(ndbcluster,[storage/ndb])
 MYSQL_PLUGIN_STATIC(ndbcluster, [[\$(ndbcluster_libs) \$(ndbcluster_system_libs) \$(NDB_SCI_LIBS)]])
 MYSQL_PLUGIN_ACTIONS(ndbcluster,[MYSQL_SETUP_NDBCLUSTER])
 MYSQL_PLUGIN_DEPENDS(ndbcluster, [partition])

storage/pbxt/plug.in

 MYSQL_STORAGE_ENGINE(pbxt,no,  [PBXT Storage Engine],
         [MVCC-based transactional engine], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(pbxt, [storage/pbxt])
 MYSQL_PLUGIN_STATIC(pbxt,    [src/libpbxt_s.la], [src/libpbxt_s_embedded.la])
 MYSQL_PLUGIN_ACTIONS(pbxt,  [
 #               AC_CONFIG_FILES(storage/pbxt/src/Makefile)

storage/xtradb/plug.in

@@ -16,7 +16,6 @@
 
 MYSQL_STORAGE_ENGINE(xtradb,  xtradb, [XtraDB Storage Engine],
         [XtraDB - a drop-in replacement for InnoDB], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(xtradb, [storage/xtradb])
 MYSQL_PLUGIN_STATIC(xtradb,   [libxtradb.la])
 MYSQL_PLUGIN_DYNAMIC(xtradb,  [ha_xtradb.la])
 MYSQL_PLUGIN_ACTIONS(xtradb,  [