* common.mk (INSTRUBY_ARGS): added --mantype to apply mdoc2man.rb
	  to man pages.  Fixes #5598. 
	  (do-install-nodoc, do-install-local, do-install-man,
	  dont-install-nodoc, dont-install-local, dont-install-man):
	  No longer needs --mantype.
	
	  Reported by Rainer Orth <ro AT cebitec.uni-bielefeld.de>,
	  patch by George Koehler <xkernigh AT netscape.net>.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34448 b2dd03c8-39d4-4d8f-98ff-823fe69b080e