build/julia: no special treatment for nemo, adding combinatorics package
build/julia: no special treatment for nemo, adding combinatorics package

DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc