arm make release failure when building BEAGLEBONE

[Dave Tyson <dtyson%anduin.org.uk@localhost>]

This is from the current source tree a little earlier today, cross 
compiling arm on amd64:

./build.sh -j 4 -U -u -x -m evbearmv7hf-el -O /home/dtyson/cross/obj -T 
/home/dtyson/cross/tools release

Might be fallout from the ata changes..
...
#   compile  compat/uipc_syscalls_30.o
/home/dtyson/cross/tools/bin/armv7--netbsdelf-eabihf-gcc -mfloat-
abi=soft -ffreestanding -fno-zero-initialized-in-bss  -O2 -fno-strict-
aliasing -fno-common     -std=gnu99   -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-sign-compare    --
sysroot=/home/dtyson/cross/obj/destdir.evbarm -mcpu=cortex-a8 -mfpu=neon 
-DKERNEL_BASES_EQUAL -DKERNEL_BASE_VOFFSET=0 -I
../../. -I/home/dtyson/cross/src/sys/../common/lib/libx86emu -
I/home/dtyson/cross/src/sys/../common/include -
I/home/dtyson/cross/src/sys/arch -I/home/dtyson/cross/src/sys -nostdinc 
-
D__HAVE_CPU_COUNTER -D__HAVE_CPU_UAREA_ALLOC_IDLELWP -
D__HAVE_FAST_SOFTINTS -D__HAVE_MM_MD_DIRECT_MAPPED_PHYS -
DKERNEL_BASE_EXT="0x80000000" -DARM_GENERIC_TODR -DCOMPAT_44 -DDIAGNOST
IC -DDEBUG -D_KERNEL -D_KERNEL_OPT -std=gnu99 -
I/home/dtyson/cross/src/sys/lib/libkern/../../../common/lib/libc/quad -
I/home/dtyson/cross/src/sys/lib/libkern/../../../common/lib/libc
/string -
I/home/dtyson/cross/src/sys/lib/libkern/../../../common/lib/libc/arch/arm/string  
--sysroot=/home/dtyson/cross/obj/destdir.evbarm  -c    
/home/dtyson/cross/src/sys/compat/co
mmon/uipc_syscalls_30.c -o uipc_syscalls_30.o
--- kern-BEAGLEBOARD ---
ata.o: In function `atabusioctl':
ata.c:(.text+0x26e0): undefined reference to `atabus_cd'
ata.c:(.text+0x26f0): undefined reference to `atabus_cd'
ata.o: In function `atabusopen':
ata.c:(.text+0x2a7c): undefined reference to `atabus_cd'
ata.c:(.text+0x2a8c): undefined reference to `atabus_cd'
ata.o: In function `atabusclose':
ata.c:(.text+0x2b50): undefined reference to `atabus_cd'
ata.o:ata.c:(.text+0x2b60): more undefined references to `atabus_cd' 
follow
--- kern-BEAGLEBONE ---

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