Bug#833396: audiotools: please make the build reproducible

[Eric Shattow]

Thanks for the patch. Note upstream commit "Have man page generator
pull time from source file":

https://github.com/tuffy/python-audio-tools/commit/86e9483eb4748f14a94258e0abbe9722987dcf35

Would cherrypicking 86e9483e make the build reproducible?