[tbb-bugs] #14422 [Tor Browser]: Fix makefile rules to make+hash incrementals by default

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#14422: Fix makefile rules to make+hash incrementals by default
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     Reporter:  mikeperry  |      Owner:  tbb-team
         Type:  defect     |     Status:  needs_review
     Priority:  normal     |  Milestone:
    Component:  Tor        |    Version:
  Browser                  |   Keywords:  tbb-gitian, TorBrowserTeam201501R
   Resolution:             |  Parent ID:
Actual Points:             |
       Points:             |
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Comment (by boklm):

 Yes, if the previous version is not present, the incremental rule will
 fail and the hash rule will not be run.

 If we want to remove the incrementals failures and replace them with a
 warning, we can change the incrementals rules to something like this:

 {{{
 incrementals:
         ../tools/update-responses/gen_incrementals release || echo
 'Warning: could not generate incremental MARs.' >&2
 }}}

 Downloading the previous version if it is missing sounds like a good idea.
 However, I don't think we currently have a place from where to download
 it, as we are removing it from dist.tpo when there is a new release.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14422#comment:5>
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