* enc/Makefile.in (ECHO1): expand NULLCMD by configured value to
get rid of a bug of nmake, that it can expand bare single name
variable but cannot in substition.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53437 b2dd03c8-39d4-4d8f-98ff-823fe69b080e