Drop C89 support (= Ruby 2.x support)?

ext/cgi/escape.c uses C99 features, which cannot use before ruby 3.0.

The latter is easy to make C89-compliant but the former needs to expand the table.

I would say C99 is okay, personally.

The problem is it must be C89-compliant to support ruby 2.x, which will not reach the EOL one year at least.

My understanding is that Ruby 2.7 is the earliest version to require a C99 compiler: https://bugs.ruby-lang.org/projects/ruby-master/wiki/C99

Apparently, the C99-ism was introduced before cgi was extracted to this repo, and it has been included in all existing gem releases 0.1.0-0.3.1.

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