[cmake-developers] Regenerating yacc/lex files

[Devin Nakamura]

I was wondering why the option to regenerate the lexer/parser sources
was removed. I tracked it down to this pull request which deals with
clang tidy warnings in the code
(https://gitlab.kitware.com/cmake/cmake/merge_requests/775). I was
wondering if there was a reason behind the removal of the option / if
anyone would object if it was added back in.