bug#66636: Move lexical-binding warning from checkdoc to byte-compiler

[Mattias Engdegård]

The warning about a missing lexical-binding cookie rather belongs in the 
compiler than checkdoc, because it's not about documentation or style but code 
generation and ability to detect errors, both which are hindered by a missing 
cookie.

Moving the warning to the compiler also makes it more widely seen.

0001-Move-lexical-binding-warning-from-checkdoc-to-byte-c.patch
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