* util.c (ruby_strtod): backported from 1.9.  a patch from Satoshi
	  Nakagawa <psychs at limechat.net> in [ruby-dev:34625]. 
	  fixed: [ruby-dev:34623]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@17282 b2dd03c8-39d4-4d8f-98ff-823fe69b080e