Allnoconfig build still broken on x86-64 in today's git.

[Rob Landley]

$ make clean && make allnoconfig && make
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf  --allnoconfig Kconfig
#
# configuration written to .config
#
Makefile:932: *** "Cannot generate ORC metadata for
CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or
elfutils-libelf-devel".  Stop.
$ grep CONFIG_UNWINDER .config
CONFIG_UNWINDER_FRAME_POINTER=y
# CONFIG_UNWINDER_GUESS is not set
$

Still an unnecessary dependency that breaks the build even when it's
configged out.

Rob