[oe] kernel_do_compile uses wrong kernel version

[Detlef Vollmann]

kernel_do_compile in kernel.bbclass uses KERNEL_MAJOR_VERSION,
which is computed based on files that don't exist at that
point in time.
It's not a real problem, as a 'make dep' is still defined
and just gives a warning, but I attached a patch nevertheless.

BTW, I'm not sure how useful get_kernelversion() really is,
as for the DEPENDS the "2.6" or "2.4" needs to be computed
based on PV anyway.

   Detlef
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