librts: avoid feeding daq config file to fmseq.pl
@ezekiel.dohmen fmseq.pl
expects to read (from stdin) a system definition file found in the fmseq
directory. The librts makefile feeds it the contents of every file in the fmseq
directory, which may also include a daq configuration file. The unexpected input produces spurious entries in the model's epics db.