Make mysqld_multi.server executable, and allow it to be installed
via chkconfig on LSB-compliant systems.


scripts/make_binary_distribution.sh:
  Adjust permissions on some support-files/* scripts:  make mysqld_multi.server
  executable, and mysql-VERSION.spec not executable.
support-files/mysqld_multi.server.sh:
  Add LSB comments for chkconfig to simplify installation for sysadmins.