Move the unconditional #include of net/ifq.h to the very end of file.
This seems to allow us to pass a universe with either clang or gcc
after r272244 (and r272260) and probably makes it easier to untabgle
these chained #includes in the future.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272261 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f