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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