Bug#1041095: Please drop installable-field-mirrors-source warning

[Michael Biebl <biebl@debian.org>]

Package: lintian
Version: 2.116.3
Severity: normal

Over the last couple of years I've received several MRs on salsa (via
the Janitor) as a result of lintian's installable-field-mirrors-source.

As an example see 
https://salsa.debian.org/utopia-team/libnma/-/merge_requests?scope=all&state=all

I consider this behaviour of lintian wrong.

If I have a src package that builds multiple binary packages and I'm
looking at debian/contol, I do want to immediately see which section a
package belongs too without having to skip back to the source package.

This lintian warning is a false optimization.
Please drop it or at least restrict it to packages building a singly
binary package.

Michael