this might need a tricky (?) check that the configuration is as needed for ecl.

otherwise, libatomic has no deps, and gc only depends on libatomic

CC: @embray @orlitzky

Component: build: configure

Author: Michael Orlitzky

Branch/Commit: e86ec71

Reviewer: Isuru Fernando

Issue created by migration from https://trac.sagemath.org/ticket/28045