* file.c (file_load_ok): checks if regular file, except for the
	  platform disallows to open directories, e.g. dosish.
	  [ruby-dev:38097], [Bug #1221]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@23038 b2dd03c8-39d4-4d8f-98ff-823fe69b080e