Including client code into embedded library

Code trimming (fixes of comments etc)


include/mysql_com.h:
  Comment fixed
include/mysql_embed.h:
  comment fixed
include/violite.h:
  comment fixed
libmysql/libmysql.c:
  #undef should work anyway
libmysqld/libmysqld.c:
  comment fixed
sql-common/client.c:
  #undef should work anyway
sql/net_serv.cc:
  #undef should work anyway