* io.c, eval.c, process.c: remove all condition of r26371.
	  now, all platform use the same way. [Bug #3278][ruby-core:30167]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@28222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e