Bug#1077604: debhelper: Remove qmake-qt4 build system (qmake-qt4 was removed in Buster)

[Niels Thykier]

Niels Thykier:
Package: debhelper
Version: 13.16
Severity: normal
X-Debbugs-Cc: ni...@thykier.net
Any use would fail anyway, so we might as well clean up the code.

Last known instance of the command was 
https://packages.debian.org/buster/amd64/qt4-qmake/filelist

Best regards,
Niels

Note to self: The removal should probably wait one release to ensure 
compat with oldoldstable (per support rules).

Best regards,
Niels