Bug#1144807: Bug#1138110: pybind11: diff for NMU version 3.0.4-0.1

[Santiago Vila]

I'll make a team upload.

However, note that NMUs which are also a "new upstream release" are
troublesome, as the archive scripts do not allow a team upload
containing the same .orig.tar.gz already in delayed/2, and this
usually forces the real maintainer to either cancel the NMU or ask the
NMUer to cancel it, which is an additional burden.