Bug#234531: lintian: Check for (build-)dep on xlibs(-dev)

[Jeroen van Wolffelaar <jeroen@wolffelaar.nl>]

Package: lintian
Version: 1.22.11
Severity: wishlist

A check should be made for (build-)dependencies on xlibs and xlibs-dev,
because they are transitional meta packages including all X libraries,
while they are now properly split up.

Fixing dependencies will make it possible to not need to install all
those X libs.

At the same time, lintian should also check for maintainers adding ALL
xlibs(-dev) dependencies, as this is very likely incorrect.

Reminder to self: Don't forget to exclude xlibs(-dev) itself from this
check...

--Jeroen