git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk.
":" in a make variable replacement cause a syntax error with
/usr/ccs/bin/make on Solaris. Uses $(NULLCMD) instead.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e