[ruby-core:102674] [Ruby master Bug#16998] [Backport] support for Bison 3 to 2.6 and 2.7

Issue #16998 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: DONE to 2.5: REQUIRED, 2.6: DONE, 2.7: DONE

ruby_2_6 r67905 merged revision(s) e9bb30d4,a064e467,4d753461.

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Bug #16998: [Backport] support for Bison 3 to 2.6 and 2.7
https://bugs.ruby-lang.org/issues/16998#change-90668

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: REQUIRED, 2.6: DONE, 2.7: DONE
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To build with latest Bison 3.5, the following commits are needed.

### for [2.7]:
* `8e694129305a3978313cf4bcd463c6aa2ba9ceb4`
* `47720e2255f34ecad49763c66a7ea02a55a3f60a` (commit log has a typo)

### for [2.6] and [2.5], preceding the above:
* `4d75346187557ae59736ca5739bfae312c285e08`
* `a064e46762ec0bfd40e6a04242d9e62fdd21e1f0`
* `e9bb30d47e5f07774cfbc69f0c8824ec921f6cda`

I made branches which resolved conflicts and fixed a typo.
[2.7]: https://github.com/nobu/ruby/tree/2.7-bison3
[2.6]: https://github.com/nobu/ruby/tree/2.6-bison3
[2.5]: https://github.com/nobu/ruby/tree/2.5-bison3




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