When you change this to true, you may need to add more tests.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* lib/mkmf.rb (MakeMakefile#macro_defined?): use clearly different
strings from conflict markers.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38199 b2dd03c8-39d4-4d8f-98ff-823fe69b080e