meta: handle symlinked hooks (#2478)

[sergiusens]

Handling of symlinked hooks broke with the introduction of #2440
which tries to change permissions of their file type which can
lead to FileNotFoundErrors as the symlinked file may not be
available at the time of the stat change.

Signed-off-by: Sergio Schvezov sergio.schvezov@canonical.com

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• If this is a bugfix. Have you checked that there is a bug report open for the issue you are trying to fix on bug reports?
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• Have you successfully run ./runtests.sh static?
• Have you successfully run ./runtests.sh tests/unit?

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[sparkiegeek]

👍

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (legacy@8f66a4e). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             legacy    #2481   +/-   ##
=========================================
  Coverage          ?   90.66%           
=========================================
  Files             ?      216           
  Lines             ?    13780           
  Branches          ?     2047           
=========================================
  Hits              ?    12494           
  Misses            ?      883           
  Partials          ?      403

Impacted Files	Coverage Δ
snapcraft/internal/meta/_snap_packaging.py	90.36% <100%> (ø)

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