debug/elf: support zstd compression

debug/elf: support zstd compression

Test cases added to debug/dwarf because that is where it matters in practice.

The new test binary line-gcc-zstd.elf built with

    gcc -g -no-pie -Wl,--compress-debug-sections=zstd line[12].c

using

    gcc (Debian 12.2.0-10) 12.2.0

with a development version of the GNU binutils.

Fixes #55107

Change-Id: I48507c96902e1f83a174e5647b5cc403d965b52b
Reviewed-on: https://go-review.googlesource.com/c/go/+/473256
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>