Four more warning fix patches

[Joerg Mayer <jmayer () loplof de>]

These patches turn on some more warnings (or not) and fixes all warnings that come up

Notes:
- 0001 is not sent (it's the previously sent -Wshadow fix)
- 0005 Fixes most of the trivial cases of -Wunused-parameter warnings. It does not enable the warning.

Please apply in case they make sense.

Kind regards
   Jörg
-- 
Joerg Mayer                                           <jmayer () loplof de>
We are stuck with technology when what we really want is just stuff that
works. Some say that should read Microsoft instead of technology.

Attachment: 0002-Add-Wcomma-and-fix-the-single-place-it-complains-abo.patch
Description:

Attachment: 0003-Add-Wmissing-noreturn-to-compiler-warnings-and-fix-a.patch
Description:

Attachment: 0004-Do-NOT-add-Wcovered-switch-default-by-default-as-the.patch
Description:

Attachment: 0005-Fix-the-Wunused-parameter-warnings-that-have-obvious.patch
Description:

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