Linux kernel-version as on i386 and ppc (currently 2.4.18), and a date
in Feb 2002.
On all other NetBSD platforms we return a Linux-kernel version of
2.0.38 and a date sometime in 2000, which (AFAIK) predates the
existence of amd64, and therefore predates Linux support for amd64.
To me, it makes much more sense to return the same Linux-kernel-version
and date for both 32-bit x86 and 64-bit x86.
Empirically (and not least), this change also allows SuSE 10 amd64
binaries to run under our Linux amd64 binary emulation (both static
and dynamic-linked, given suitable setup) , which they didn't when we
reported a Linux/x86_64 kernel version of 2.0.38.
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