[tbb-bugs] #28467 [Applications/Tor Browser]: Update README.HACKING for adding part about working with submodules and binary patches

[Tor Bug Tracker & Wiki]

#28467: Update README.HACKING for adding part about working with submodules and
binary patches
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, TorBrowserTeam201811R,      |  Actual Points:
  GeorgKoppen201811                              |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:  tbb-rbm, TorBrowserTeam201811, GeorgKoppen201811 => tbb-rbm,
     TorBrowserTeam201811R, GeorgKoppen201811
 * status:  new => needs_review


Comment:

 `bug_28467` (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/commit/?h=bug_28467&id=f9d51d616ba174348d846e247287b4e3156824f3)
 has some fixups.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28467#comment:1>
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