[ruby/etc] Drop binary gems support
Revert "Added build:mingw" e1674c18f5a0faf881b362363f428d139baef3b4.
https://github.com/ruby/etc/commit/d8f1dd85d3
Added by nobu (Nobuyoshi Nakada) about 5 years ago
[ruby/etc] Drop binary gems support
Revert "Added build:mingw" e1674c18f5a0faf881b362363f428d139baef3b4.
https://github.com/ruby/etc/commit/d8f1dd85d3