"Server variables for plugins"
  Post review fixes.


client/mysql.cc:
  wl2936 "Plugin server variables" post review fixes
  compile fix. app_type is now a void* and it isn't actually used here.
include/my_getopt.h:
  wl2936 "Plugin server variables" post review fixes
  make app_type into a void*. This also required changes to 
  client/mysql.cc and storage/ndb/src/mgmsrv/InitConfigFileParser.cpp
  in order to compile.
include/my_global.h:
  wl2936 "Plugin server variables" post-review fixes
  declare compile_time_assert() macro.
  (provided by serg)
include/mysql/plugin.h:
  wl2936 "Plugin server variables" post review fixes
  Add comments
mysys/array.c:
  wl2936 "Plugin server variables" post review fixes
mysys/typelib.c:
  wl2936 "Plugin server variables" post review fixes
  find_typeset() should not alter string
sql/set_var.cc:
  wl2936 "Plugin server variables" post review fixes
  remove unnecessary code.
sql/sql_class.cc:
  wl2936 "Plugin server variables" post review fixes
  explicitly declare export style for functions.
sql/sql_lex.cc:
  wl2936 "Plugin server variables" post review fixes
  enforce that lex::plugins_static_buffer is declared immediately after
  lex::plugins.
sql/sql_plugin.cc:
  wl2936 "Plugin Server variables" post review fixes
    sys_var_pluginvar does not need st_plugin_int at construction.
    remove debug code which was accidentially committed.
    add comments.
    fix mutex lock order.
sql/sql_plugin.h:
  wl2936 "Plugin server variables" post review fixes
  add comment and macro to compare plugin_refs
sql/table.cc:
  wl2936 "plugin server variables" post review fixes
  remove unneccessary unlock and variable.
  add checks for legacy type validity
storage/ndb/src/mgmsrv/InitConfigFileParser.cpp:
  wl2936 "plugin server variables" post review fixes
  fix compile failure now that my_option::app_type is a void*