Having a dependency on (guix build syscalls) this deep in the stack
would make it much harder to change syscalls.scm.
* gnu/packages/python-xyz.scm (python-dbusmock)[native-inputs]: Remove TINY.
[arguments]: Remove #:imported-modules, and remove (guix build syscalls)
from #:modules. Rewrite ‘check’ phase to reap processes from the build
process itself.