Buildworld fails on FreeBSD 5.2.1

[Loren M. Lang]

A make buildworld fails to compile FreeBSD 5.2.1-p9 with the warning
dereferencing type-punned pointer will break strict-aliasing and -Werror
is set.  The first library it fails on is libpam compiled staticly.
Even if I set -DNO_WERROR to get past libpam, a later part will fail
with the same warning, but if I have -DNO_WERROR set for the entire
buildworld, it finishes.  I've had this problem since I tried to compile
5.2.1-p2 so I haven't been able to upgrade once beyond 5.2.1.  I haven't
seen anything relevent in the UPDATING file.

Relevant make.conf lines:
CPUTYPE=p3
CFLAGS=-O2 -pipe

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