refactor: Use cmp instead of msgpack-c for events packing.

This library is better in every way.

.github/scripts/cmake-android

@@ -51,22 +51,6 @@ autoreconf -fi
 make -j"$(nproc)" install
 cd ..
 
-# Build msgpack
-if [ ! -d msgpack-c ]; then
-  git clone --branch=c-4.0.0 https://github.com/msgpack/msgpack-c.git
-fi
-rm -rf msgpack-c/build
-mkdir -p msgpack-c/build
-cd msgpack-c/build
-cmake .. \
-  -DMSGPACK_BUILD_EXAMPLES=OFF \
-  -DCMAKE_TOOLCHAIN_FILE="$NDK/build/cmake/android.toolchain.cmake" \
-  -DANDROID_ABI="$ABI" \
-  -DCMAKE_INSTALL_PREFIX="$PREFIX" \
-  -DCMAKE_PREFIX_PATH="$PREFIX"
-cmake --build . --target install
-cd ../..
-
 # Build c-toxcore
 rm -rf _build
 mkdir -p _build

.github/scripts/cmake-osx

@@ -11,7 +11,6 @@ brew install \
   libconfig \
   libsodium \
   libvpx \
-  msgpack \
   opus
 
 . ".github/scripts/flags-clang.sh"

.github/scripts/coverage-linux

@@ -6,7 +6,6 @@ NPROC=$(nproc)
 
 sudo apt-get install -y --no-install-recommends \
   libgtest-dev \
-  libmsgpack-dev \
   libopus-dev \
   libsodium-dev \
   libvpx-dev \

.github/scripts/sonar-prepare

@@ -4,7 +4,6 @@ set -eu
 
 sudo apt-get install -y --no-install-recommends \
   libconfig-dev \
-  libmsgpack-dev \
   libopus-dev \
   libsodium-dev \
   libvpx-dev \