[Tile-serving] [osm2pgsql] Initial libosmium port (#379)

[Paul Norman]

I'm getting an error building on my Ubuntu test box

```
autoreconf: running: /usr/bin/autoconf --force
configure.ac:34: error: possibly undefined macro: AC_CHECK_PROG
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:37: error: possibly undefined macro: AC_MSG_ERROR
configure.ac:86: error: possibly undefined macro: AS_IF
autoreconf: /usr/bin/autoconf failed with exit status: 1
```

The relevant part of configure.ac is
```autoconf
dnl Find C++ compiler
AC_PROG_CXX
AC_CHECK_PROG(HAVE_CXX, $CXX, yes, no)
if test "$HAVE_CXX" = "no" 
then
  AC_MSG_ERROR([Could not find a c++ compiler]);
fi
```
https://github.com/lonvia/osm2pgsql/blob/libosmium-port/configure.ac#L32-L38



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