env variables broken on OS X

[weinand]

In the VS Code alpha 51209bb
task are no longer working:

Reverting the latest commit related to env vars (4cd1c0f) seems to fix this problem.

On OS X the env command does not support a --null option:

[Tyriar]

Thanks for reverting @weinand, looking at this now.

[Tyriar]

The problem with not using --null is that multi-line vars can always break the system. Consider the following:

export TEST_ENV_VAR="Multi
LINE=string"

Which is output in env or printenv as:

TEST_ENV_VAR=Multi
LINE=string

[Tyriar]

Lists all environment variables names: compgen -A variable

It seems to include additional ones on top of env though.