[Toybox] [PATCH] getconf: add cache size sysconf() queries.

[enh]

It can otherwise be quite awkward to get at this --- riscv64 puts it all
neatly in the ELF auxv, x86-64 has it all in /proc, arm64 only exposes
L1 instruction/data line sizes.

Annoyingly, none of musl, the BSDs, or Apple implement these sysconf()
queries. But they're useful (and otherwise inaccessible from the command
line) for the systems that _do_ support them.
---
 toys/posix/getconf.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
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