build: generalize antlr grammar build rule
build: generalize antlr grammar build rule

Currently it contains hard-coded target file names.  Replace with a variable.

bowlofstew/scylla,victorbriz/scylla,tempbottle/scylla,avikivity/scylla,guiquanz/scylla,acbellini/scylla,senseb/scylla,senseb/scylla,guiquanz/scylla,gwicke/scylla,tempbottle/scylla,duarten/scylla,kjniemi/scylla,rluta/scylla,tempbottle/scylla,asias/scylla,aruanruan/scylla,asias/scylla,linearregression/scylla,dwdm/scylla,asias/scylla,justintung/scylla,phonkee/scylla,phonkee/scylla,rentongzhang/scylla,victorbriz/scylla,aruanruan/scylla,scylladb/scylla,linearregression/scylla,acbellini/scylla,stamhe/scylla,kjniemi/scylla,rluta/scylla,acbellini/scylla,victorbriz/scylla,eklitzke/scylla,rentongzhang/scylla,gwicke/scylla,justintung/scylla,gwicke/scylla,aruanruan/scylla,rentongzhang/scylla,rluta/scylla,stamhe/scylla,wildinto/scylla,respu/scylla,dwdm/scylla,raphaelsc/scylla,eklitzke/scylla,linearregression/scylla,avikivity/scylla,senseb/scylla,justintung/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,duarten/scylla,wildinto/scylla,bowlofstew/scylla,kangkot/scylla,capturePointer/scylla,eklitzke/scylla,shaunstanislaus/scylla,capturePointer/scylla,avikivity/scylla,respu/scylla,respu/scylla,stamhe/scylla,glommer/scylla,kangkot/scylla,glommer/scylla,guiquanz/scylla,phonkee/scylla,kjniemi/scylla,capturePointer/scylla,dwdm/scylla,bowlofstew/scylla,shaunstanislaus/scylla,scylladb/scylla,raphaelsc/scylla,wildinto/scylla,kangkot/scylla,duarten/scylla,shaunstanislaus/scylla,glommer/scylla