[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2749: remove the version-checking code from `__init__.py`

[Tahoe-LAFS]

#2749: remove the version-checking code from `__init__.py`
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     Reporter:  warner     |      Owner:
         Type:  defect     |     Status:  new
     Priority:  normal     |  Milestone:  undecided
    Component:  packaging  |    Version:  1.10.2
   Resolution:             |   Keywords:
Launchpad Bug:             |
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Comment (by warner):

 #2873 brought up a case where those checks do not know as much about
 version strings as the real setuptools does, blocking us from changing our
 dependency on `twisted[tls]` to `twisted[tls,conch]` because it makes
 `check_all_requirements()` crash.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2749#comment:1>
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