[Tile-serving] [openstreetmap/osm2pgsql] Travis fix for osx (#1041)

[mmd]

This is pretty much the only confirmation I got working on travis for OSX.

Unfortunately, I won't work with newer xcode releases due to some Apple bug (https://github.com/Homebrew/homebrew-core/issues/44579, see error message below). Also, it uses gcc-9 instead of clang. If someone happens to have lots of time and patience, we might get clang working at some point in the future again.

Changes were heavily inspired by https://github.com/google/crc32c/blob/master/.travis.yml



--- 

```
/Applications/Xcode-11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/resource.h:443:34: error: expected initializer before '__OSX_AVAILABLE_STARTING'

  443 | int     getiopolicy_np(int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
```
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1041

-- Commit Summary --

  * Travis fix for Mojave

-- File Changes --

    M .travis.yml (40)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1041.patch
https://github.com/openstreetmap/osm2pgsql/pull/1041.diff

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