Fix Hurd build

Samuel Thibaultrequested to merge
sthibaul/libssh-mirror:master into master

Fix build on GNU/Hurd.

It does not have a PATH_MAX compile-time limitation. Instead of using it we can just allocate dynamically.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • [N/A] Test suite updated with functionality tests
  • [N/A] Test suite updated with negative tests
  • [N/A] Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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