Appveyor: Preserve timestamps to make sure ruby-compile isn't retriggered
Appveyor: Preserve timestamps to make sure ruby-compile isn't retriggered

larskanis/rubyinstaller2,larskanis/rubyinstaller2,larskanis/rubyinstaller2,oneclick/rubyinstaller2,oneclick/rubyinstaller2,oneclick/rubyinstaller2