Bug#880776: mrtg build depends on removed libgd2*-dev provides

[Adrian Bunk]

Source: mrtg
Version: 2.17.4-4
Severity: serious
Tags: buster sid

The following packages have unmet dependencies:
 builddeps:mrtg : Depends: libgd2-noxpm-dev but it is not installable


Please change the build dependency to libgd-dev.