merge revision(s) 42713: [Backport #8792]

	* configure.in (sys/pstat.h): fix missing header check for
	  missing/setproctitle.c on HP-UX.  [ruby-core:56644] [Bug #8792]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e