Diff reduction with kernel code: instruct the compiler that the data of
these types may be unaligned to their "normal" alignment and exercise
caution when accessing them.

PR:		194071
MFC after:	3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272389 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Add IFCAP_HWSTATS.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272390 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f