[current tinderbox] failure on amd64/amd64

[Warner Losh]

Subject: [current tinderbox] failure on amd64/amd64

> cc -O2 -pipe  -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I-   -include /tinderbox/CURRENT/amd64/amd64/obj/amd64/tinderbox/CURRENT/amd64/amd64/src/sys/GENERIC/opt_global.h -I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000 -fno-common -g -fno-omit-frame-pointer -I/tinderbox/CURRENT/amd64/amd64/obj/amd64/tinderbox/CURRENT/amd64/amd64/src/sys/GENERIC -mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -fformat-extensions -std=c99 -c /tinderbox/CURRENT/amd64/amd64/src/sys/modules/aio/../../kern/vfs_aio.c
> In file included from /tinderbox/CURRENT/amd64/amd64/src/sys/modules/aio/../../kern/vfs_aio.c:28:
> @/sys/buf.h: In function `BUF_KERNPROC':
> @/sys/buf.h:340: warning: dereferencing type-punned pointer will break strict-aliasing rules
> @/sys/buf.h:340: warning: dereferencing type-punned pointer will break strict-aliasing rules
> @/sys/buf.h:340: warning: dereferencing type-punned pointer will break strict-aliasing rules
> *** Error code 1

This looks ugly to fix.  Why are we compiling without
-fno-strict-alias again?

Warner