[Tile-serving] [osm2pgsql] Fix CPPFLAGS propagation in configure script (#103)

[jocelynj]

CPPFLAGS were not correctly propagated from shell setting to Makefile, because of this missing line in m4/ax_lib_geos.m4.

This made debian hardening checks failing: http://qa.debian.org/bls/packages/o/osm2pgsql.html
You can merge this Pull Request by running:

  git pull https://github.com/jocelynj/osm2pgsql cppflags

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

  https://github.com/openstreetmap/osm2pgsql/pull/103

-- Commit Summary --

  * Fix CPPFLAGS propagation by saving it in m4/ax_lib_geos.m4
  * Remove non-necessary echo in m4/ax_lib_geos.m4

-- File Changes --

    M m4/ax_lib_geos.m4 (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/103.patch
https://github.com/openstreetmap/osm2pgsql/pull/103.diff
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