* guix-package.in (%options): Add `--verbose'. (show-help): Update accordingly. (guix-package): Parameterize `current-build-output-port' according to VERBOSE?. By default, silence the environment build's output.
* guix-package.in (%options): Add `--verbose'. (show-help): Update accordingly. (guix-package): Parameterize `current-build-output-port' according to VERBOSE?. By default, silence the environment build's output.