sysutils/xenkernel4[68] build errors on NetBSD 7

["Gary Duzan" <gary%duzan.org@localhost>]

if : false; then rm -f /usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/xen.efi; echo 'EFI support disabled'; fi
EFI support disabled
rm -f /usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/.xen.efi.[0-9]*
ld -L/usr/lib -Wl,-R/usr/lib -L/usr/pkg/lib -Wl,-R/usr/pkg/lib    -melf_x86_64     -melf_x86_64  -T xen.lds -N prelink.o \
    /usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/symbols-dummy.o -o /usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/.xen-syms.0
prelink.o: In function `do_domctl':
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/domctl.c:381: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/domctl.c:1141: undefined reference to `__stack_chk_fail'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/domctl.c:1141:(.text+0x394f): relocation truncated to fit: R_X86_64_PLT32 against undefined symbol `__stack_chk_fail'
prelink.o: In function `do_xen_version':
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/kernel.c:231: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/kernel.c:363: undefined reference to `__stack_chk_fail'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/common/kernel.c:363:(.text+0x11401): relocation truncated to fit: R_X86_64_PLT32 against undefined symbol `__stack_chk_fail'
[...]
prelink.o: In function `alternative_instructions':
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/alternative.c:187: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/alternative.c:211: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/alternative.c:211: undefined reference to `__stack_chk_fail'
prelink.o: In function `construct_dom0':
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/domain_build.c:878: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/domain_build.c:1640: undefined reference to `__stack_chk_guard'
/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/arch/x86/domain_build.c:1640: undefined reference to `__stack_chk_fail'
Makefile:107: recipe for target '/usr/pkg/work/sysutils/xenkernel46/work/xen-4.6.5/xen/xen-syms' failed

   sysutils/xenkernel48 gets similar results, but both build fine
on NetBSD 8.

				Gary Duzan