Condition testing for Linux version 4.14 is spelled LINUX_4_14, not
LINUX_4.14, so the checks were ineffective up to this change.
This Fixes the following error which appeared after update to 2.12.0,
when built against kernel 4.14:
Package kmod-openvswitch-intree is missing dependencies for the
following libraries:
tunnel6.ko
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>