Log Message:
x11/lxqt-admin: update to 0.15.0

lxqt-admin-0.15.0 / 2020-04-23
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  * Bumped version to 0.15.0.
  * Removed (duplicated) string casts definitions.
  * Avoid `==` shell test usage.
  * Allow build admin-user on NBSD.
  * Use QString Use multi-arg.
  * Replace deprecated QLatin1Literal.
  * Use the static QFileInfo method `exists()`.
  * Avoided C++11 possible range-loop Qt container detach.