Issue #9838 has been reported by okkez _.

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Backport #9838: Build error when USE_RGENGC is 0
https://bugs.ruby-lang.org/issues/9838

* Author: okkez _
* Status: Open
* Priority: Normal
* Assignee: 
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r45224 をruby_2_1ブランチにバックポートして欲しいです。

https://github.com/ruby/ruby/commit/8b5fddab280653c19d7d998e0b1d95188774ced4



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