build on Ubuntu 16.04 with build.sh

[Lotharla]

The 'build.sh' script fails on building the embedding example.
Cmake output tells me:
-- Could NOT find Boost: missing: python-py3 (found /usr/local/lib/cmake/Boost-1.71.0/BoostConfig.cmake (found version "1.71.0"))

A solution was removing '-DPYTHON_VERSION_SUFFIX=-py3' in line 10 of 'build.sh'.
After that the build of all the examples was successful, also the tests.

Environment:

• OS: Ubuntu Linux
• Version 16.04
• Python Version 3.5
• Boost Version 1.71
• gcc (Ubuntu 5.5.0-12ubuntu1~16.04) 5.5.0 20171010