build: fix elfutils dependency build

[leodido]

Signed-off-by: Leo Di Donato [email protected]

The current xmake version (2.8.1) contains a regression in their autoconf module that does not let us (or anybody) build elfutils properly from their official xmake repository (which also got fixes after my issue disclosure).

This WIP PR (DO NOT MERGE) prepares changes for when xmake v2.8.2 is officially released.

Next step:

• [ ] wait for xmake 2.8.2 and update the .devcontainer/Dockerfile to install it

Fixes #14 Refs https://github.com/xmake-io/xmake-repo/issues/2313

[fntlnz]

Thank you!