mkmf.rb: timestamp_file
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
mkmf.rb: timestamp_file
special character of NMAKE and BSD make. [Bug #7265]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e