amd64 build failure on HEAD

[Paul Goyette <paul%whooppee.com@localhost>]

With sources updated on 2025-08-28 at 03:52:17 UTC I get the
following when running ``build.sh release''

...
making sure the kern library is up to date...
depending the kern library objects
making sure the kern library is up to date...
building standard kern library
making sure the kern library is up to date...
/build/netbsd-current/src_ro/sys/arch/xen/xen/if_xennet_xenbus.c:229:29: error: 'IF_XNFRX_LOWAT' undeclared here (not in a function); did you mean 'IF_XNFRX_LOWAT_MAX'?
  229 | static int if_xnfrx_lowat = IF_XNFRX_LOWAT;
      |                             ^~~~~~~~~~~~~~
      |                             IF_XNFRX_LOWAT_MAX
--- if_xennet_xenbus.o ---

*** Failed target: if_xennet_xenbus.o
*** In directory: /build/netbsd-current/obj/amd64/sys/arch/amd64/compile/XEN3_DOMU
*** Failed commands:
	${NORMAL_C}
	=> @: echo "compile  XEN3_DOMU/if_xennet_xenbus.o" &&  : echo /build/netbsd-current/tools/x86_64/amd64/bin/x86_64--netbsd-gcc   -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -mno-avx -msoft-float   -mno-fp-ret-in-387  -ffreestanding -fno-zero-initialized-in-bss  -fno-delete-null-pointer-checks  -g -O2 -fno-omit-frame-pointer -fstack-protector -Wstack-protector   --param ssp-buffer-size=1   -fstack-usage -Wstack-usage=3584  -fno-strict-aliasing -fno-common     -std=gnu11   -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wno-unreachable-code -Wno-pointer-sign -Wno-attributes -Wno-type-limits -Wextra -Wno-unused-parameter -Wold-style-definition -Wno-sign-compare    -Wno-address-of-packed-member  -Walloca     --sysroot=/build/netbsd-current/dest/amd64 -Damd64 -Dx86_64 -I. -I/build/netbsd-current/obj/amd64/sys/arch/amd64/compile/XEN3_DOMU/xen-ma -I/build/netbsd-current/src_ro/sys/external/mit/xen-include-public/dist/ -I/build/netbsd-current/src_ro/sys/external/bsd/libnv/dist -I/build/netbsd-current/src_ro/sys/external/bsd/acpica/dist -I/build/netbsd-current/src_ro/sys/../common/lib/libx86emu -I/build/netbsd-current/src_ro/sys/../common/lib/libc/misc -I/build/netbsd-current/src_ro/sys/../common/include -I/build/netbsd-current/src_ro/sys/arch  -I/build/netbsd-current/src_ro/sys -nostdinc -DCOMPAT_UTILS  -D__XEN_INTERFACE_VERSION__="0x3020a"  -DDIAGNOSTIC  -DCOMPAT_44 -D_KERNEL -D_KERNEL_OPT -std=gnu11 -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/quad -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/string -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/arch/x86_64/string -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/arch/x86_64/atomic -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/hash/sha3   -D_FORTIFY_SOURCE=2 -I/build/netbsd-current/src_ro/sys/external/bsd/libnv/dist -c /build/netbsd-current/src_ro/sys/arch/xen/xen/if_xennet_xenbus.c -o if_xennet_xenbus.o  &&  /build/netbsd-current/tools/x86_64/amd64/bin/x86_64--netbsd-gcc   -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -mno-avx -msoft-float   -mno-fp-ret-in-387  -ffreestanding -fno-zero-initialized-in-bss  -fno-delete-null-pointer-checks  -g -O2 -fno-omit-frame-pointer -fstack-protector -Wstack-protector   --param ssp-buffer-size=1   -fstack-usage -Wstack-usage=3584  -fno-strict-aliasing -fno-common     -std=gnu11   -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wno-unreachable-code -Wno-pointer-sign -Wno-attributes -Wno-type-limits -Wextra -Wno-unused-parameter -Wold-style-definition -Wno-sign-compare    -Wno-address-of-packed-member  -Walloca     --sysroot=/build/netbsd-current/dest/amd64 -Damd64 -Dx86_64 -I. -I/build/netbsd-current/obj/amd64/sys/arch/amd64/compile/XEN3_DOMU/xen-ma -I/build/netbsd-current/src_ro/sys/external/mit/xen-include-public/dist/ -I/build/netbsd-current/src_ro/sys/external/bsd/libnv/dist -I/build/netbsd-current/src_ro/sys/external/bsd/acpica/dist -I/build/netbsd-current/src_ro/sys/../common/lib/libx86emu -I/build/netbsd-current/src_ro/sys/../common/lib/libc/misc -I/build/netbsd-current/src_ro/sys/../common/include -I/build/netbsd-current/src_ro/sys/arch  -I/build/netbsd-current/src_ro/sys -nostdinc -DCOMPAT_UTILS  -D__XEN_INTERFACE_VERSION__="0x3020a"  -DDIAGNOSTIC  -DCOMPAT_44 -D_KERNEL -D_KERNEL_OPT -std=gnu11 -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/quad -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/string -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/arch/x86_64/string -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/arch/x86_64/atomic -I/build/netbsd-current/src_ro/sys/lib/libkern/../../../common/lib/libc/hash/sha3   -D_FORTIFY_SOURCE=2 -I/build/netbsd-current/src_ro/sys/external/bsd/libnv/dist -c /build/netbsd-current/src_ro/sys/arch/xen/xen/if_xennet_xenbus.c -o if_xennet_xenbus.o  &&  : echo /build/netbsd-current/tools/x86_64/amd64/bin/nbctfconvert -g -L VERSION -g if_xennet_xenbus.o &&  /build/netbsd-current/tools/x86_64/amd64/bin/nbctfconvert -g -L VERSION -g if_xennet_xenbus.o
*** [if_xennet_xenbus.o] Error code 1

nbmake[2]: stopped making "all" in /build/netbsd-current/obj/amd64/sys/arch/amd64/compile/XEN3_DOMU



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