By setting the lowest 4 bytes of the IV to the sequence number IV's get reused.

Instead use set the top 4 bytes of the IV to the sequence number

This should prevent any blocking on retransmits on the output side

Fixes ffmpeg compilation in MinGW when linked with librist

Prevent crash from happening for the case of a peer connection coming from the same IP and same port as one of our listening peers

Fix mutex lock on peer list. This could potentially fix crashes related to peers being added or removed by applications after a flow has started.

EAI_NONAME is equal to 8, so instead of return there was null-pointer exception on res[0] access.
getaddrinfo returns 0 in case of success, thus need to check for non-zero result.

MacOS need's us to bind with INADDR_ANY & portno to respond back on multicasted packets, otherwise we get an error 49 when trying to send RTCP data back

Add error message when output fifo queue overflows and calling application did not set a receive callback

Refactor clock_gettime support for Darwin to fix compilation problems for older OSes

Previous method was written only our MinGW setup in mind.
This corrects build failures due to missing cmake toolchainfile, which may not be needed for other builds (as tested with provided aarch64 cross file).
Meson >= 0.56.0 correctly generates the cmake toolchain file (and documentation explicitly states not to set this option manually), so there it is not used
The toolchain variable has been renamed to make more sense when used in other arches, and in a way that it should not clash with any meson native options.