appveyor.yml: try porting r67454 to msys2
Trying to fix https://ci.appveyor.com/project/ruby/ruby/builds/23639998/job/0hm9v79xlryod1ff
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67455 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Added by k0kubun (Takashi Kokubun) over 6 years ago
appveyor.yml: try porting r67454 to msys2
Trying to fix
https://ci.appveyor.com/project/ruby/ruby/builds/23639998/job/0hm9v79xlryod1ff
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67455 b2dd03c8-39d4-4d8f-98ff-823fe69b080e