[Tile-serving] [openstreetmap/osm2pgsql] Fix: Results of tasks run in thread pool were not checked (#1229)

[Jochen Topf]

If a function run in the thread pool throws an exception, this exception
was never "collected", it was silently ignored. This commit fixes this
by wrapping the osmium::thread::Pool class in a class of our own that
keeps track of the futures returned by submit() and allows checking
them.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1229

-- Commit Summary --

  * Fix: Results of tasks run in thread pool were not checked

-- File Changes --

    M src/CMakeLists.txt (1)
    M src/middle-pgsql.cpp (2)
    M src/middle-pgsql.hpp (2)
    M src/middle-ram.cpp (2)
    M src/middle-ram.hpp (2)
    M src/middle.hpp (5)
    M src/osmdata.cpp (10)
    M src/output-flex.cpp (2)
    M src/output-flex.hpp (2)
    M src/output-gazetteer.hpp (2)
    M src/output-multi.cpp (2)
    M src/output-multi.hpp (2)
    M src/output-null.hpp (2)
    M src/output-pgsql.cpp (2)
    M src/output-pgsql.hpp (2)
    M src/output.hpp (5)
    A src/thread-pool.hpp (50)
    M tests/test-parse-osmium.cpp (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1229.patch
https://github.com/openstreetmap/osm2pgsql/pull/1229.diff

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