svn commit: r204025 - head/share/mk

[M. Warner Losh]

In message: <201002180206.o1I26vjl023579 at svn.freebsd.org>
            Marcel Moolenaar <marcel at FreeBSD.org> writes:
:   Allow suppression of -Wcast-align for WARNS>=4 by defining
:   NO_WCAST_ALIGN. The headers of the standard C++ library are
:   not 64-bit clean and trigger the warning. This prevents use
:   of WARNS>=4 on ia64 for example.

Even 32-bit ARM has issues with alignment and things like data puning
of types like sockaddr.

Warner