Extracted mutate_buildpacks_constructive method from common buildpacks mutating code
Extracted mutate_buildpacks_constructive method from common buildpacks mutating code

Faisalawanisee/heroku,sancopanco/heroku,sancopanco/heroku,dickeyxxx/heroku,macedo/heroku,greeca0204/heroku,rkh/heroku,gregburek/heroku,vcgato29/heroku,dickeyxxx/heroku,vcgato29/heroku,duypq94/heroku,Faisalawanisee/heroku,macedo/heroku,rkh/heroku,gregburek/heroku,macedo/heroku,Faisalawanisee/heroku,vcgato29/heroku,gregburek/heroku,duypq94/heroku,rkh/heroku,greeca0204/heroku,dickeyxxx/heroku,duypq94/heroku,greeca0204/heroku,sancopanco/heroku