* gnu/packages/libffi.scm (python-cffi)[arguments]: Substitute INVOKE for SYSTEM*, end phases with #t, and remove unneeded bits from the ‘install-doc’ phase.
* gnu/packages/libffi.scm (python-cffi)[arguments]: Substitute INVOKE for SYSTEM*, end phases with #t, and remove unneeded bits from the ‘install-doc’ phase.