Debianisms in KF5 Python bindings

Hello,

currently the Python bindings for KF5 are not buildable for anything that's 
not Ubuntu / Debian:

- libclang is found using a homegrown method (as opposed to ClangConfig.cmake) 
and it only works if it's in the form libclang-$major.$minor.so: anything else 
(like in Gentoo, Arch Linux, openSUSE) is not being picked up
- At the same time, clang/clang++ is only found if it's in the form 
"$CLANG_PROGRAM-$MAJOR_VERSION.$MINOR_VERSION", but for example in openSUSE we 
ship it as "clang++-$major.$minor.$micro"
- It doesn't pick up properly the SIP includes for Python 3 (doesn't in 
openSUSE, nor in Gentoo) which live in /usr/include/python3.6m/sip.h

We were not even aware things were not being found unless we inspected the 
build logs and tried to replicate things locally. I understand doing cross-
distro work is difficult, but it would be best to at least encourage testing by 
distros with a new feature is out, rather than just pushing it in isolation, 
or at least ask for testing after being pushed.


-- 
Luca Beltrame - KDE Forums team
GPG key ID: A29D259B

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