Fix build with future glibc (major/minor macros), BSD compatible

Summary:
Also adding sys/types.h which is not implicitly included from all over.

Thanks-to: [ade] in #kde-devel

See also:
https://sourceware.org/ml/libc-alpha/2015-11/msg00452.html
https://git.reviewboard.kde.org/r/127662/

BUG: 376505

Reviewers: Plasma, graesslin

Reviewed By: Plasma, graesslin

Subscribers: graesslin, plasma-devel, kwin, KWin, adridg

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D6175