bug #20318 (ctype_ucs2_def test fails with embedded)

there was two problems about charsets in embedded server
1. mysys/charset.c - defined there default_charset_info variable is
modified by both server and client code (particularly when
--default-charset option is handled)
In embedded server we get two codelines modifying one variable.
I created separate default_client_charset_info for client code

2. mysql->charset and mysql->options.charset initialization isn't
properly done for embedded server - necessary calls added


include/sql_common.h:
  client charset info default declared
libmysqld/lib_sql.cc:
  thd_init_client_charset calls added
libmysqld/libmysqld.c:
  check_embedded_connection moved to client.c to avoid code duplication
sql-common/client.c:
  charset initialization moved to mysql_init_character_set to
  be used in embedded server
sql/sql_parse.cc:
  thread client charset initialization moved to thd_init_client_charset
  to avoid code duplication

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sql_common.h b/include/sql_common.h
index c07a4a831bb..9fc8d4f457b 100644
--- a/include/sql_common.h
+++ b/include/sql_common.h
@@ -22,6 +22,7 @@ extern const char	*not_error_sqlstate;
 extern "C" {
 #endif
 
+extern CHARSET_INFO *default_client_charset_info;
 MYSQL_FIELD *unpack_fields(MYSQL_DATA *data,MEM_ROOT *alloc,uint fields,
 			   my_bool default_value, uint server_capabilities);
 void free_rows(MYSQL_DATA *cur);