9dbabd0a8b
We have these pretty macros, let's use them everywhere (so far we mostly used them for newer additions only). This PR is mostly an excercise in "perl -p -i -e", but there are some special cases: * idn-util.c exposes a function whose prototype in the official library headers is marked with the "const" attribute, and this apparently does not propagate along typeof() correctly and then __builtin_types_compatible_p() fails later because it detects that prototype and original function don't match in prototype. * libbpf removed some symbols in newer versions, hence we need to define some prototypes manually to still be able to build. * libcryptsetup marked a symbol as deprecated we want to use (knowing it is deprecated). By using the macros this is detected by the compiler. We work around it via the usual warning off macros. Note by using these macros we assume that all symbols are known during build time. Which might not be the case. We might need to revert this commit for some symbols if this trips up builds on older distros.
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