[tor-bugs] #31679 [Core Tor/Tor]: Make checkShellScripts.sh handle path errors better

[Tor Bug Tracker & Wiki]

#31679: Make checkShellScripts.sh handle path errors better
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     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:  testing
Actual Points:  0             |  Parent ID:
       Points:  0             |   Reviewer:
      Sponsor:                |
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 checkShellScripts.sh has two minor bugs:
 * it should handle being called from its parent directory on systems
 without realpath
 * it should exit with an error status if it can't find the src directory

 This is a fix on master, so it doesn't need a changes file.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31679>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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