* build-aux/cuirass/gnu-system.scm: Move code to...
* build-aux/cuirass/hydra-to-cuirass.scm: ... here, and include it.
* Makefile.am (EXTRA_DIST): Add 'build-aux/cuirass/hydra-to-cuirass.scm'
and 'build-aux/cuirass/gnu-system.scm'.
Fixes a bug whereby we would 'write' raw <license> objects when they
were in a list.
* build-aux/cuirass/gnu-system.scm (entry->sexp-entry): Add recursive
case when O is a list.