fix DL/Fiddle logic stop using ffi
fix DL/Fiddle logic stop using ffi

the ffi_lib attempt didn't work.  also fix to delay the require of
the 'dl' library until we've determined that Fiddle does not meet
our needs (otherwise we get deprecation warnings even though we
don't wind up using DL).

kou/ffi-yajl,h4ck3rm1k3/ffi-yajl,h4ck3rm1k3/ffi-yajl,chef/ffi-yajl,h4ck3rm1k3/ffi-yajl,chef/ffi-yajl,kou/ffi-yajl,kou/ffi-yajl,chef/ffi-yajl