Building against libcec >=4.x (P8, Ubuntu 20.04)

[tomm3h]

I realise there have been a number of years since there was any activity to this repo, but if I may document my current woes in attempting to build libcec-daemon against libcec=4.0.4, in an Ubuntu 20.04 (x86_64) environment.

Initially, configure fails on, $PKG_CONFIG --print-errors --cflags --libs "libcec >= 2.1". Runnning this command manually highlights the need to also install packages libp8-platform-dev (which requires libfstrcmp0 & libfstrcmp0-dev) and libudev-dev.

Unfortunately, make then fails in a fashion that I'm not capable of unpicking. My programming prowess isn't up to very much, much less my C++.

Output from 'make' in the case that it helps, attached here.

If anyone's still running the daemon out there on an up to date system, please do let me know how you did it. :)

[matthewbauer]

This should be fixed in #32.

[tomm3h]

This should be fixed in #32.

Cloned from your branch, and it built on my first attempt. Thank you! If you or bramp require any output, please do let me know.