Opam builds packages in an isolated environment, but packages still
assume they can access system tools like a compiler, make, etc... Mount
/gnu and /run/current-system so these tools are also available to opam
packages on GuixSD.
* gnu/packages/ocaml.scm (opam)[arguments]: Fix bwrap.sh to also mount
the store and the system profile in the opam environment.
2a6ba9ff61