sample-rc: Give the only anon module-set a name.
It is optional for module-sets to have names, but it's still a good idea to *have* a name since kdesrc-build will try to provide you information on which module-set a given module is being built from. If no name is present then you'll get an ugly name for the set like "Building qca from <module-set at line 34>". As long as the user doesn't mind that's fine, but our base configuration should set a higher standard. This was the only anonymous module-set in the current base configuration. Thanks to Laurent for the report. BUG:409198 FIXED-IN:19.08