net-firewall/fwknop: do not call distutils-r1_src_prepare

net-firewall/fwknop: do not call distutils-r1_src_prepare

Firstly, this helps to avoid potential problems with double patching
because both autotools-utils_src_prepare and distutils-r1_src_prepare
try to apply patches from PATCHES variable and call epatch_user.

Secondly, fwknop's Python module does not need any special stuff that
distutils-r1_src_prepare does. On the contrary, without extra copying
of Python files, the build is happening the way it is supported and
expected by upstream.

Package-Manager: portage-2.2.24