ruby: trying to make `make rpm` work, again:
ruby: trying to make `make rpm` work, again:

changeset 93385d665e3d removed activerecord-monetdb-adapter;
hence, we better also remove the code/specification to build the respective RPM.

This hopefully fixes the currently broken building of RPMs (`make rpm`).

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb