Integrate meta-seconorth-distro/fix_weston_profile

Commit: seco-ne/yocto/layers/meta-seconorth-distro@81fb1d73

base:profile: Extend weston profile to detect correct UID

Using a fixed UID breaks easily, if other users are added to the build. Detect the correct UID before exporting the XDG_RUNTIME_DIR variable.