Fix and improve debugging. #10
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The original code tried to map belle_sip_deb(...) (i.e., a variadic
macro) to bctbx_debug(...) (i.e., another variadic macro as the
replacement).
This didn't work for multiple reasons:
- no code used belle_sip_deb(), but actually belle_sip_debug().
- the target function has to be called with either a named variadic
argument (e.g., "nameargs..." -> "nameargs") or, if it's
unnamed/anonymous via the portable __VA_ARGS__ name/macro.
Rename it to belle_sip_debug and make it a non-variadic substitution to
bctbx_debug, since the usage is 1:1 currently.
If it stops being a 1:1 replacement in the future, it's easy to just
make it variadic again such as via:
belle_sip_debug(args...) some_func(NULL, args)
(Still) disabled by default, of course.
Instead, let's just use the proper format specifier. Since belle-sip already requires C99, it should always be available.
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Fixes and improves debugging features a tiny bit.