[COOK-680] dont rebuild gecode if it is already installed
[COOK-680] dont rebuild gecode if it is already installed

DataDog/opscode-cookbooks,gravitystorm/cookbooks,beni55/cookbooks,DataDog/opscode-cookbooks,beni55/cookbooks,beni55/cookbooks,dagolden/opscode-cookbooks,beni55/cookbooks,dagolden/opscode-cookbooks,gravitystorm/cookbooks,beni55/cookbooks,dagolden/opscode-cookbooks,gravitystorm/cookbooks,DataDog/opscode-cookbooks,beni55/cookbooks