[tor-bugs] #33987 [Applications/Tor Browser]: Make var/build_id_txt work in non-build steps

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#33987: Make var/build_id_txt work in non-build steps
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 Reporter:  boklm                     |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam202004      |  Actual Points:
Parent ID:  #33973                    |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by boklm):

 I think this patch should fix the issue:
 https://gitweb.torproject.org/user/boklm/tor-browser-
 build.git/commit/?h=bug_33987&id=32e6bcd3b6db11313be8bfdce475555bbf72138b

 I am now checking that the filename of tor-browser (which is using
 `var/build_id` recursively from all projects) is the same with and without
 this patch. While checking that I noticed that the `showconf` command does
 not initialize `step` by default, and opened #33990 for that.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33987#comment:1>
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