[ragel] [PATCH] document fall-through cases in a generated code

[Rinat Ibragimov]

Hi.

GCC7's Wimplicit-fallthrough diagnostics triggers a lot on generated C
code in "-G2" mode. It was intended to catch errors, in hope that
developer would document places where code is intended to fall through
case statement. But currently there are no such comments in a generated
code.

Patch is against ragel-6 branch.

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Rinat
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