vsearch: Use core/zlib not dupes/zlib for Linuxbrew
vsearch: Use core/zlib not dupes/zlib for Linuxbrew

philippbayer/homebrew-science,pditommaso/homebrew-science,maplesond/homebrew-science,quantumsteve/homebrew-science,heuermh/homebrew-science,dpo/homebrew-science,andrewjpage/homebrew-science