[Tile-serving] [openstreetmap/mod_tile] Use anonymous shared memory segments for `mod_tile.so` (PR #459)

[Hummeltech]

Rather than named shared memory segments (see [here](https://apr.apache.org/docs/apr/trunk/group__apr__shm.html#gac370c4943c22505ce2b0d57c51805480)).

Fixes tests on `macOS` unable to run in parallel, which was likely an indicator of a greater issue with `macOS` builds
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/459

-- Commit Summary --

  * Use anonymous shared memory segments here
  * Rename delay_mutex to delaypool_mutex (to match stats)
  * Use P_tmpdir rather than /tmp

-- File Changes --

    M .github/workflows/build-and-test.yml (1)
    M src/mod_tile.c (46)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/459.patch
https://github.com/openstreetmap/mod_tile/pull/459.diff

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