Build failure - amd64

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

With sources updated on 2015-08-21 at 01:49:45 UTC, a build with a clean 
$DESTDIR fails (while building i915_params.c) with

In file included from /build/netbsd-local/src/sys/external/bsd/drm2/dist/include/drm/drmP.h:45:0,
                 from /build/netbsd-local/src/sys/external/bsd/drm2/dist/drm/i915/intel_bios.h:31,
                 from /build/netbsd-local/src/sys/external/bsd/drm2/dist/drm/i915/i915_drv.h:47,
                 from /build/netbsd-local/src/sys/external/bsd/drm2/dist/drm/i915/i915_params.c:27:
/build/netbsd-local/src/sys/external/bsd/drm2/dist/drm/i915/i915_params.c:43:39: error: 'CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT' undeclared here (not in a function)
  .preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
                                       ^
/build/netbsd-local/src/sys/external/bsd/common/include/linux/kernel.h:44:29: note: in definition of macro 'IS_ENABLED'
 #define IS_ENABLED(option) (option)
                             ^
*** [i915_params.o] Error code 1
nbmake[8]: stopped in /build/netbsd-local/src/sys/modules/i915drmkms
1 error




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