Bug#975488: lammps FTBFS: error: format not a string literal and no format arguments

[Graham Inggs]

Control: severity -1 normal

Per reproducible builds [1], lammps starting building again around 2020-11-30.
The recent binNMU for Python 3.9 only was also successful.


[1] https://tests.reproducible-builds.org/debian/history/amd64/lammps.html