Make sure the build passes if the source is not in a git repository.
Again, that means that version information won't be available, but there
is only so much we can do about that.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Some distributions use their own Makefile and thus won't create version.h,
resulting in a build failure. Pass the version as define instead.
That won't help for generating the driver version with those distributions,
but at least the driver will build.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
