* guix/build/bournish.scm (rm-command): New procedure. (%commands): Use it. * tests/bournish.scm: Add tests for "rm" and "rm -r".
* guix/build/bournish.scm (%bournish-language): Add a joiner to SCHEME. Compile only to Scheme. * tests/bournish.scm: New file. * Makefile.am (SCM_TESTS): Add it.