[Tile-serving] [osm2pgsql] Multithreading on Windows (#464)

[alex85k]

Currently when running a Windows build tets, I get many warnings
```
1: WARNING: osm2pgsql was compiled without fork, only using one process!
```
But I see that there is no actual fork() in code, only in broken node-persistent-cache-reader.cpp
There are also unused fork-related defines here: 
https://github.com/openstreetmap/osm2pgsql/blob/master/middle-pgsql.cpp#L87

Maybe it is time to remove #ifdef HAVE_FORK from options.hpp and allow Windows users to use multithreading too?
 ( Or now it strictly requires Pthread? ...)




---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/464
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