* module/Makefile.am:
* module/srfi/srfi-4/gnu.scm: New module, for extensions to srfi-4.
Currently defines the any->FOOvector family.
* libguile/srfi-4.c:
* libguile/srfi-4.i.c: Dispatch scm_any_to_FOOvector calls to the
scheme-implemented functions in (srfi srfi-4 gnu).
