build: haskell-build-system: Support multiple libraries.

build: haskell-build-system: Support multiple libraries.

Fixes <https://bugs.gnu.org/53655>.

The patch handles correctly the multiple registration of some package using
their own internal sub-libraries.  It allows to call 'install-transitive-deps'
multiple times and deals with packages requiring a multiple registration.

* guix/build/haskell-build-system.scm (register)[install-transitive-deps]:
Guard also the destination direction.
[install-config-file]: New procedure.

Co-Authored-by: zimoun <zimon.toutoune@gmail.com>.
Signed-off-by: Lars-Dominik Braun <lars@6xq.net>