Fix crypto suite tag overflow. It was casted to unsigned char which overflows when it reaches 256

Workaround libtirpc link conflict with libc by allowing multiple definitions (only for Debian 11 and GCC), bugreport sent to Debian

liblinphone!1993 (merged) belle-sip!254 (merged)

Mantis: https://mantis.linphone.org/view.php?id=10085