rpm: add compatible library for libmysqlservices.a

Mroonga links with libmysqlservices.a for MySQL 5.5, but it is not
shipped by RPM-based Linux distributions.

This is RPM-based Linux distributions specific issue because
distributions based on Debian provides it in libmysqld-dev package.

TODO: negotiate upstream to ship libmysqlservices.a in dev package
or as a shared library(.so).
rpm: specify option to enable compatible library on RPM-based distributions