Issue pr203

[cvvergara]

Follow up of #203

FindLibPQXX.cmake does not find the version of libpqxx

[cvvergara]

@rvlander Can you test with the libpqxx version

To create a local copy of the branch of this PR

git checkout -b cvvergara-issuePR203 master
git pull https://github.com/cvvergara/osm2pgrouting.git issuePR203

part of the generated messages:

-- Performing Test COMPILER_SUPPORTS_CXX0X - Success
-- Performing Test COMPILER_SUPPORTS_CXX11
-- Performing Test COMPILER_SUPPORTS_CXX11 - Success
-- Performing Test COMPILER_SUPPORTS_CXX14
-- Performing Test COMPILER_SUPPORTS_CXX14 - Success
-- Using  -std=c++14.
-- LIBPQXX_INCLUDE_DIRS: /usr/include
-- POSTGRESQL_INCLUDE_DIR: /usr/include/postgresql
-- EXPAT_INCLUDE_DIRS: /usr/include
-- Boost_INCLUDE_DIRS: /usr/include
-- POSTGRESQL_LIBRARIES: /usr/lib/x86_64-linux-gnu/libpq.so
-- Boost_LIBRARIES: 
-- LIBPQXX_LIBRARIES: /usr/lib/x86_64-linux-gnu/libpqxx.so
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vicky/pgrouting/osm2pgrouting/vicky/build
Scanning dependencies of target osm2pgrouting
[  4%] Building CXX object CMakeFiles/osm2pgrouting.dir/src/osm_elements/Way.cpp.o
[  8%] Building CXX object CMakeFiles/osm2pgrouting.dir/src/osm_elements/osm_tag.cpp.o

[rvlander]

@cvvergara it compiled successfully.