[OE-core] linux-yocto and linux-libc-headers are again going backwards

[Martin Jansa]

Either use 4.7.99+4.8-rc4 like most other recipes do or at least "4.8~rc4"
which might sort lower than "4.8" (but needs to be verified for all
packaging backends first).

Ignoring all this completely results with what we can see in oe-core
now:

ERROR: linux-libc-headers-4.8-r0 do_packagedata: QA Issue: Package
version for package linux-libc-headers-dbg went backwards which would
break package feeds from (0:4.8-rc4-r0.0 to 0:4.8-r0.0)
[version-going-backwards]
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