Bug#845595: meaningless warnings for bash-completion scripts which are always sourced

[Matthias Klose <doko@debian.org>]

Package: lintian
Version: 2.5.49
Severity: important
Tags: sid stretch

according to
https://lintian.debian.org/maintainer/debian-gcc@lists.debian.org.html#libabigail

lintian issues some meaningless warnings:

libabigail (1.0~rc5-4) Info Package Tracker Bugs (up-to-date, last processed by
Lintian/2.5.49)
abigail-tools
W executable-not-elf-or-script
usr/share/bash-completion/completions/abicompat
usr/share/bash-completion/completions/abicompat
usr/share/bash-completion/completions/abidiff
usr/share/bash-completion/completions/abidiff
usr/share/bash-completion/completions/abidw
usr/share/bash-completion/completions/abidw
usr/share/bash-completion/completions/abilint
usr/share/bash-completion/completions/abilint
usr/share/bash-completion/completions/abinilint
usr/share/bash-completion/completions/abinilint
usr/share/bash-completion/completions/abipkgdiff
usr/share/bash-completion/completions/abipkgdiff
usr/share/bash-completion/completions/abisym
usr/share/bash-completion/completions/abisym

please just drop these. they are meaningless. bash completion scripts are always
sourced and don't need to be scripts.