- added a usermod call to assign a potential existing mysql user to the
   correct user group (BUG#12823)
 - Save the perror binary built during Max build so it supports the NDB
   error codes (BUG#13740)
 - added a separate macro "mysqld_group" to be able to define the
   user group of the mysql user seperately, if desired.


support-files/mysql.spec.sh:
   - added a usermod call to assign a potential existing mysql user to the
     correct user group (BUG#12823)
   - Save the perror binary built during Max build so it supports the NDB
     error codes (BUG#13740)
   - added a separate macro "mysqld_group" to be able to define the
     user group of the mysql user seperately, if desired.