No functionality changes are made.
% make kernel-toolchain buildkernel TARGET_ARCH=<arch>buildworld buildkernel TARGET_ARCH=<arch>
% make installkernel
... reboot etc.
% make installworld
... reboot etc
% make -C .../tests/sys/kern
with nooptions SCTP and options SCTP for i386, amd64 and aach64/arm64
And some/few regression tests.