merge revision(s) 39481: [Backport #7941]

	* configure.in (unexpand_shvar): Use the numeric comparison
	  operator instead of '==' which is a ksh extention. [Bug #7941]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39702 b2dd03c8-39d4-4d8f-98ff-823fe69b080e