Ruby

transform_mjit_header.rb: add system_header pragma

• tool/transform_mjit_header.rb: insert GCC system_header pragma
  to get rid of errors caused by the contents included from system
  headers.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65169 b2dd03c8-39d4-4d8f-98ff-823fe69b080e