cdefs: Remove CC_SUPPORTS macros, they are unused

Remove CC_SUPPORTS_INLINE, CC_SUPPORTS___INLINE,
CC_SUPPORTS___FUNC, CC_SUPPORTS_WARNING,
CC_SUPPORTS_VARADIC_XXX, CC_SUPPORTS_DYNAMIC_ARRAY_INIT: they are
unused. Also remove them from the generated cryptodevh.py script.

Retain, for the moment, CC_SUPPORTS_INLINE, since it's used in this
file.

PR: 275221 (exp-run)
Sponsored by: Netflix