Allow the use of CMake to compile the example

[Miouyouyou]

This adds the possibility to use CMake, instead of the Autotools, to build the example. Autogen is still present and usable, though.

The biggest problem I have with ./autogen.sh is that it takes between 30 seconds to one minute to get the whole project prepared, on some ARMv7 boards. CMake takes a few seconds at most, on the same hardware.

Signed-off-by: Myy [email protected]