ffi: prepare for variably sized enum implementation.

This lays the groundwork for enumerations based off types
other than int. All we need to do is implement the
syntax for this.

* ffi.c (ffi_enum_put, ffi_enum_get, ffi_enum_rput,
ffi_enum_rget): Retrieve the element type descriptor
and recurse into its put, get, rput and rget operation,
respectively, instead of hard-coded calls to the int
operations.
(make_ffi_type_enum): New argument, base_type.
Numerous properties of the enum type are taken from base_type:
the FFI type, the alignment, size, and alloc, free and
clone operations. The base type is installed as eltype.
(ffi_type_lookup): Static function relocated.
(ffi_type_compile): In the enum case, resolve the int type
and pass to make_ffi_type_enum.

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