The build of the examples is complaining about a function that are not
inline'd. The compiler is mentioned this because we use the '-I'
directive for pointing to the header files. Just say the compiler also
that the header files are system headers so the false positive is going
away.
After including the doc/ and the tests/ folder under the hood of the
autotools now adding the examples/ foolder too.
The user is now able to add the build of the example binarys if
configure is called with '--enable-examples' as option. The example
binarys will not be build by default!
Currently only 'coap-client', 'coap-server' and 'rd' is build.