Log Message:
lxqt-build-tools: import new package, version 0.6.0

Build tooling (mostly CMake files) for the LXQt desktop environment
and related applications.

Packaged in pkgsrc-wip by pin, as part of a broader effort toward
providing all of LXQt and associated utility applications. General
reviews, feedback, and testing of such by gdt@, ng0@, and myself.