libkephal includes

[nihui]

hi all

I am currently developing an alternative to plasma workspace using kde libraries.

I found that plasma uses libkephal to handle screen changes, so I may follow the way how plasma does it. Unfortunately, the kephal library development files are not installed by default, and I have to copy these includes locally to make thins work with some tricks.

It would nice to install kephal includes as the libtaskmanager does.

best wishes
nihui