merge revision(s) 35589: [Backport #8406]

	* configure.in (POSTLINK): default to : command to get rid of flag
	  only command, since BSD make does not work with it.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40983 b2dd03c8-39d4-4d8f-98ff-823fe69b080e