[Tile-serving] [osm2pgsql] Explain why fork() failed (#47)

[Seth Fitzsimmons]

In my experience, it's often because the cache size was set too high and fork()
can't allocate sufficient memory for the child. However, if nothing to this
effect is output, it's not clear what can be done.

This adds such output.
You can merge this Pull Request by running:

  git pull https://github.com/mojodna/osm2pgsql fork-error-message

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/osm2pgsql/pull/47

-- Commit Summary --

  * Explain why fork() failed

-- File Changes --

    M middle-pgsql.c (5)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/47.patch
https://github.com/openstreetmap/osm2pgsql/pull/47.diff

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