fetchzip: fix `extraPostFetch` concatenation

4a5c49363a58e711c2016b9ebb6f642e3c9c1be5 added some more commands after
`extraPostFetch` but concatenated them without a separating newline.

Which means, that since that commit

  fetchzip { ..., extraPostFetch = ''rm -f "$out"/some-file''; }

now actually runs the following shell command

  rm -f "$out"/some-file"chmod -R a-w "$out"

thus deleting "$out". Which is very unfortunate.

Especially since this actually happens on master for all `fetchFromBitbucket`
derivations. But since the results are fixed-output users bulding with hydra
cache enabled are not hitting this for not recently updated derivations yet.

0 files changed, 0 insertions, 0 deletions