WITHOUT_INET6 broken on CURRENT

[Garrett Cooper]

Hi Randall,
    I recently rebuilt my sources today and I noticed that it's now
breaking on a valid warning with sctp:

cc -c -O2 -frename-registers -pipe -fno-strict-aliasing -march=nocona
-std=c99 -g -Wall -Wredundant-decls -Wnested-externs
-Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline
-Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions -nostdinc
-I. -I/usr/src/sys -I/usr/src/sys/contrib/altq -D_KERNEL
-DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common
-finline-limit=8000 --param inline-unit-growth=100 --param
large-function-growth=1000  -fno-omit-frame-pointer -mcmodel=kernel
-mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-sse3 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables
-ffreestanding -fstack-protector -Werror
/usr/src/sys/netinet/sctputil.c
cc1: warnings being treated as errors
In file included from /usr/src/sys/netinet/sctputil.c:6553:
/usr/src/sys/netinet6/sctp6_var.h:57: warning: 'struct icmp6_hdr'
declared inside parameter list
/usr/src/sys/netinet6/sctp6_var.h:57: warning: its scope is only this
definition or declaration, which is probably not what you want
*** Error code 1

Stop in /usr/obj/usr/src/sys/OPTIMUS.
*** Error code 1

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

Stop in /usr/src.

    I'm going to rebuild setting WITHOUT_SCTP for now, but this needs
to be fixed.
Thanks,
-Garrett