Log Message:
msgpack: updated to 6.0.2

version 6.0.2

Fix header file installation to respect CMAKE_INSTALL_INCLUDEDIR
Support absolute path for CMAKE_INSTALL_*DIR
Removed invalid ctest option.
Support relative path for CMAKE_INSTALL_*DIR

version 6.0.1 for C

Improve CI environment
Improve build system

version 6.0.0

Remove C++ requirement if test is disabled
<< breaking changes >>

Change CMake package name of C library to msgpack-c
Unified all C package, library, cmake, tarball name become msgpack-c.