[ruby/strscan] Use C90 as far as supporting 2.6 or earlier (https://github.com/ruby/strscan/pull/101)
https://github.com/ruby/strscan/commit/d31274f41b
[ruby/strscan] Use C90 as far as supporting 2.6 or earlier
(https://github.com/ruby/strscan/pull/101)
https://github.com/ruby/strscan/commit/d31274f41b