This allows for linuxkpi_version.mk to be included by other projects
(namely nvidia-drm) so that those projects can define the same
LINUXKPI_VERSION macro and avoid build issues.

(cherry picked from commit 3492b0996a05f8bd0238ffb3dad73bbed17f1df0)
(cherry picked from commit 56fb82509588ba4d9171cc3bea742ade802defab)