linux: fix architecture returned for uname on aarch64

[trasz]

Summary

Previously it would return "arm64", which was breaking build
for Linux kernel. While here, reshuffle entries in the auxv
vector to match real Linux.

[trasz]

Drop spurious diff.

[emaste]

Seems to be extra changes still, relative to the commit message?

[trasz]

Hm, can you point me at the exact line?

[emaste]

I mean AT_PAGESZ and LINUX_AT_HWCAP2, lines 175 and 189.

[trasz]

Drop LINUX_AT_HWCAP2.

[trasz]

Ah, sorry. I've removed AT_HWCAP2; the AT_PAGESZ was there before, just out of order.

[trasz]

(Tinderboxed.)