Revert "chore(scripts): In env.sh don't assume that ./dart-sdk exists "
Revert "chore(scripts): In env.sh don't assume that ./dart-sdk exists "

This reverts commit 4b121eed4cfe20fc34de4f5fda4a6c639428b8af.

rkirov/angular.dart,ronlobo/angular.dart,rkirov/angular.dart,ronlobo/angular.dart,trinarytree/angular.dart,giovannicandido/angular.dart,winstonewert/angular.dart,winstonewert/angular.dart,SibuStephen/angular.dart,ronlobo/angular.dart,SibuStephen/angular.dart,SibuStephen/angular.dart,winstonewert/angular.dart,winstonewert/angular.dart,trinarytree/angular.dart,rkirov/angular.dart,trinarytree/angular.dart,hitesh97/angular.dart,giovannicandido/angular.dart,rkirov/angular.dart,ronlobo/angular.dart,hitesh97/angular.dart,hitesh97/angular.dart,giovannicandido/angular.dart,SibuStephen/angular.dart,hitesh97/angular.dart,trinarytree/angular.dart