[InterNetNews/inn] 83eb9c: tombstone-e2e: use POSIX shell for portability

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 83eb9ca4ddaf1145d7fc0cb8a96fa133f08a8542
      https://github.com/InterNetNews/inn/commit/83eb9ca4ddaf1145d7fc0cb8a96fa133f08a8542
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-06-19 (Fri, 19 Jun 2026)

  Changed paths:
    M tests/expire/tombstone-e2e.t

  Log Message:
  -----------
  tombstone-e2e: use POSIX shell for portability

The test relied on GNU-style options unavailable on AIX and Solaris
native tools: grep -F, sed -i, and a \t escape in a sed character
class.

Replace them with POSIX-only helpers so the test runs
without requiring GNU tools or innshellvars detection:

  - contains(): a while-read/case substring matcher (no grep -F)
  - countlines(): wc -l | tr -cd '0-9' (no sed, handles AIX wc
    leading whitespace)
  - setconf(): sed > tmp && mv (no sed -i)

Fixes #345.
Closes #347.



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