Change CMake package name of C++ library to msgpackc-cxx

Author: traversaro

test-install/CMakeLists.txt

@@ -4,7 +4,7 @@ project(test-install LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(msgpack REQUIRED)
+find_package(msgpackc-cxx REQUIRED)
 
 add_executable(test-install simple.cpp)
 target_link_libraries(test-install PRIVATE msgpackc-cxx)