Problem is that some files moved to storage/*/ still are dependent
on sql/ code (usually use members of THD structure)
that can get different being compiled with another #define-s
Code added to recompile these for the embedded server


config/ac-macros/plugins.m4:
  macros added to check if the storage has sql/ - dependent code
libmysqld/Makefile.am:
  symlink files from storage/*/ needed to be recompiled
  with EMBEDDED_LIBRARY
storage/federated/plug.in:
  ha_federated.cc uses THD structure
storage/heap/plug.in:
  ha_heap.cc uses THD structure
storage/innobase/plug.in:
  ha_innodb.cc uses THD structure
storage/myisam/plug.in:
  ha_myisam.cc uses THD structure
storage/myisammrg/plug.in:
  ha_myisammrg.cc uses THD structure