hton32 as well. [ruby-talk:85377]

* pack.c (swap16): swap 2 bytes no matter how big short is on the
  platform.  swap32() is also prepared.

* numeric.c (rb_num2int): returns long to preserve information.
  rb_fix2int(), rb_num2uint(), rb_fix2uint() as well.
  [ruby-talk:85377]

* numeric.c (rb_num2uint): should not check for value range if the
  source value is negative.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5075 b2dd03c8-39d4-4d8f-98ff-823fe69b080e