* guix/scripts/build.scm (show-build-options-help): Document -L. (%standard-build-options): Add -L/--load-path. * tests/guix-package.sh: Test it.
* guix/scripts/build.scm (show-build-options-help): Document -L. (%standard-build-options): Add -L/--load-path. * tests/guix-package.sh: Test it.