Bug#826070: python-escript: FTBFS in indep-only mode: no prerm scripts to tweak

[Aaron M. Ucko]

Source: python-escript
Version: 4.2.0.1-2
Severity: serious
Justification: fails to build from source (but built successfully in the past)

Thanks for fixing python-escript's build dependencies quickly.
Architecture-specific builds now look good for the most part (aside
from portability issues to some non-release architectures), but the
arch-all-only build failed:

  sed -i -e 's/#PACKAGE#/python-escript/' debian/python-escript/DEBIAN/prerm
  sed: can't read debian/python-escript/DEBIAN/prerm: No such file or directory
  debian/rules:133: recipe for target 'override_dh_gencontrol' failed

Could you please take a look?  I think it might suffice to rename the
target to override_dh_gencontrol-indep.

Thanks!