• bignum.c (validate_integer_pack_format): numwords argument added.
  Move a varidation from rb_integer_pack_internal and rb_integer_unpack.
  (rb_integer_pack_internal): Follow above change.
  (rb_integer_unpack): Ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41232 b2dd03c8-39d4-4d8f-98ff-823fe69b080e