MAKE-BINDINGS: fix the splicing impedance mismatch between the inner and the outer code invocations
Allow non-keywords to be index variables for C-REF (and related)
Implement FOREIGN-TYPE-NAME for WRAPPER.

This assumes any wrapper follows the naming convention used by
autowrap, where the class-name of the wrapper is the same symbol as
the type-name it represents.
Change load order so WRAPPER is available to SFFI
Export DEFINE-FOREIGN-{RECORD,ENUM}