Bug#1005806: gtk2hs-buildtools: gtk2hsC2hs fails with code preprocessed by GCC-11

[Apollon Oikonomopoulos]

Package: gtk2hs-buildtools
Version: 0.13.8.0-1
Severity: serious
Tags: upstream fixed-upstream
Justification: Other packages FTBFS
Control: block 1005657 by -1
Control: block 1005676 by -1

gtk2hsC2hs fails when fed with code preprocessed by GCC-11, as it 
doesn't expect zeros in line numbers. This is similar to #984167 and
has been fixed upstream in https://github.com/gtk2hs/gtk2hs/pull/304.

Regards,
Apollon