5.1 to 5.2.1 update

[Schrodinger]

In doing a make buildworld from 5.1 RELEASE to RELENG_5_2 it crapped out
with this:

===> lib/libpam/modules/pam_echo
cc -O2 -pipe -ffast-math -march=pentiumpro
-I/usr/src/lib/libpam/modules/pam_echo/../../../../contrib/openpam/include
-I/usr/src/lib/libpam/modules/pam_echo/../../libpam -Wsystem-headers -Werror
-Wall -Wno-format-y2k -W -Wstrict-prototypes -Wmissing-prototypes
-Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow
-Wcast-align -Wno-uninitialized  -c
/usr/src/lib/libpam/modules/pam_echo/pam_echo.c
/usr/src/lib/libpam/modules/pam_echo/pam_echo.c: In function `_pam_echo':
/usr/src/lib/libpam/modules/pam_echo/pam_echo.c:92: warning: dereferencing
type-punned pointer will break strict-aliasing rules
*** Error code 1

Stop in /usr/src/lib/libpam/modules/pam_echo.
*** Error code 1

Stop in /usr/src/lib/libpam/modules.
*** Error code 1

Stop in /usr/src/lib/libpam.
*** Error code 1

Has anyone else experienced this?

Conor.