DMI_EXACT_MATCH was added to the kernel in version 3.10.21 and collides 
with backports version. DMI_EXACT_MATCH is only used by the intel GPU 
driver which is not build by OpenWrt, so remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38976 3c298f89-4303-0410-b956-a3cf2f4a3e73