MFH: r513607 r513609 r513610

Update to 2.4.9

Changes: https://www.ruby-lang.org/en/news/2019/10/02/ruby-2-4-9-released/

		https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-4-8-released/

PR: 240983
Submitted by: Yasuhiro KIMURA <yasu@utahime.org>
Security: f7fcb75c-e537-11e9-863e-b9b7af01ba9e

Update to 2.5.7

Changes: https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-5-7-released/
PR: 240984
Submitted by: Yasuhiro KIMURA <yasu@utahime.org>
Security: f7fcb75c-e537-11e9-863e-b9b7af01ba9e

Update to 2.6.5

Changes: https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-6-5-released/
PR: 240985
Submitted by: Yasuhiro KIMURA <yasu@utahime.org>
Security: f7fcb75c-e537-11e9-863e-b9b7af01ba9e

Approved by: ports-secteam (joneum)