The MySQL team has two virtuals now for 7 months, virtual/mysql and
virtual/libmysqlclient.

From now on, virtual/mysql is to be used for a local server install,
including embedded servers (libmysqld.so).  virtual/mysql-5.6-r8 begins
to enforce this.

virtual/libmysqlclient is for linking to the client libraries and will
track the library changes in a subslot.  Use this when you only need to
link to libmysqlclient.so and don't necessarily need the server install
to be local.

Please adjust any packages as you see fit while doing maintenance.

Brian Evans
MySQL Lead