fuse: remove unneeded version check and compat code

[ThomasWaldmann]

we require >= 1.3 now anyway, see setup.py.

Looks like this was forgotten to backport to 1.1-maint and also was a remainder still requiring distutils.

Thanks to @LocutusOfBorg for pointing to the right changeset in master.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.1-maint@b4b1c40). Click here to learn what that means.
The diff coverage is 24.30%.

❗ Current head 66afc0c differs from pull request most recent head 92a4ab4. Consider uploading reports for the commit 92a4ab4 to get more accurate results

@@             Coverage Diff              @@
##             1.1-maint    #5936   +/-   ##
============================================
  Coverage             ?   79.89%           
============================================
  Files                ?       27           
  Lines                ?    10460           
  Branches             ?     1841           
============================================
  Hits                 ?     8357           
  Misses               ?     1580           
  Partials             ?      523           

Impacted Files	Coverage Δ
src/borg/archive.py	81.39% <ø> (ø)
src/borg/archiver.py	81.44% <ø> (ø)
src/borg/cache.py	85.33% <ø> (ø)
src/borg/constants.py	100.00% <ø> (ø)
src/borg/crypto/key.py	87.10% <ø> (ø)
src/borg/crypto/nonces.py	94.64% <ø> (ø)
src/borg/helpers.py	87.84% <ø> (ø)
src/borg/locking.py	86.71% <ø> (ø)
src/borg/logger.py	72.26% <ø> (ø)
src/borg/lrucache.py	100.00% <ø> (ø)
... and 12 more

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