ruby.git/tool/downloader.rb, branch v3_0_4

Increase the # of downloader.rb's retry attempts

2020-11-23T08:06:51+00:00

Apparently 9 was not enough either.
https://rubyci.org/logs/rubyci.s3.amazonaws.com/rhel_zlinux/ruby-master/log/20201123T063303Z.fail.html.gz

Try to fix download error

2020-11-20T05:18:14+00:00

https://github.com/ruby/ruby/runs/1428320660?check_suite_focus=true#step:9:10
```
tool/downloader.rb:243:in `rescue in download': failed to download config.guess (RuntimeError)
OpenURI::HTTPError: 403 Forbidden: https://cdn.jsdelivr.net/gh/gcc-mirror/gcc@master/config.guess
```

Use https for downloading Unicode data.

2020-03-09T04:39:23+00:00

  Retry with 90de118a75921a08497b41de2950971073b3c924

  [Bug #13962][ruby-core:83074]

Use jsDelivr instead of raw.githubusercontent.com

2019-11-22T04:55:59+00:00

Try to fix download error on Solaris CI

https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable11x/ruby-master/log/20191121T162422Z.fail.html.gz
```
tool/downloader.rb:243:in `rescue in download': failed to download config.guess (RuntimeError)
Net::HTTPFatalError: 503 "Service Unavailable": https://raw.githubusercontent.com/gcc-mirror/gcc/master/config.guess
```

Revert "Fix building with 1.8 BASERUBY"

2019-05-30T01:03:21+00:00

This reverts commit 05bc14d81a1d7f6af826a92371aeff0c3fb2a67e.

We have decided that the cost of reintroducing support for 1.8
BASERUBY outweighs the benefit.  If you are still using 1.8 and want
to build master/trunk, build and install the latest release, and use
that as BASERUBY.

Clean a garbage [ci skip]

2019-05-28T05:20:59+00:00

Fix building with 1.8 BASERUBY

2019-05-28T03:55:56+00:00

Escape dots in regexp

2019-05-24T10:03:29+00:00

switch UNICODE_BETA to NO (one more try, first try didn't work)

2019-05-24T09:22:36+00:00

    Unicode version 12.1.0 was officially released on May 7th, 2019.
    There were no changes at all from the "real" beta
    published shortly after the new era name "Reiwa" was announced.
    So we can switch UNICODE_BETA back to NO.

    common.mk: switch UNICODE_BETA back to NO
    tool/downloader.rb: add additional conditions to avoid an error
                        when moving from beta to final

Change Accept-Encoding from `*` to `identity`

2019-04-30T13:35:38+00:00

When `Accept-Encoding` is `*`,
http://www.unicode.org/Public/12.1.0/ucd/ returns gzipped content now.
So set `identity`.