3.4.1 calc should build a .dbd file without any reference to sequencer-dependent
code when SNCSEQ is not found in configure/RELEASE, but it wasn't.  To fix,
edit calcApp/src/Makefile, replacing this:

	calcSupport.dbd: $(dbdlist) ../editSseq.dbd
		$(PERL) -MExtUtils::Command -e cat $^ > $@

	calc.dbd: $(dbdlist) ../editSseq.dbd
		$(PERL) -MExtUtils::Command -e cat $^ > $@

with this:

	calcSupport.dbd: $(dbdlist)
		$(PERL) -MExtUtils::Command -e cat $^ > $@

	calc.dbd: $(dbdlist)
		$(PERL) -MExtUtils::Command -e cat $^ > $@