bug#64917: 30.0.50; c-ts-mode throws warnings about missing cpp support

[Richard Stallman]

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      > Eli> Please install the C++ grammar as well.  Those two go together 
because
      > Eli> some *.h files could be C or C++, and we can only test that at run
      > Eli> time.

I suggest we ought to make a way for a user who never operates on C++
programs to deactivate C++, deactivate this test, and not load
anything for C++.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)