libva: 1.1.1 -> 1.3.2
intelgen4asm: Remove obsolete package
intel-gpu-tools: Add derivation
vaapi-intel: 1.0.20 -> 1.3.2
add peco: Simplistic interactive filtering tool
qt5: remove references to /usr/{share,lib}/X11/locale/

Qt5 currently hardcodes /usr/{share,lib}/X11/locale/. Fix it to use
paths from the nix store. Qt4 is unaffected.

This fixes a startup warning for applications built with qt5 (e.g.
qtcreator, shotcut):

  Qt Warning: Could not find a location of the system's Compose files. Consider setting the QTCOMPOSE environment variable.
added astromenace: Hardcore 3D space shooter