sys/_offsetof.h: pacify GCC 12's macro redefinition checkHEADmain

GCC 12 has a strict definition of identity (all characters including
whitespace must be identical) when comparing "redefined" macros. Make
our definition exactly match the stddef.h that comes with GCC to fix
test-includes of netlink/netlink_snl.h.  (Note: later versions of GCC
are a bit more flexible and don't have this problem.)

Reported by:	des
Sponsored by:	DARPA, AFRL
Fixes:		2adc3f0db187 ("stddef.h: centralize definition of offsetof()")

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