Add msgpackc to the NAMES; fixes #551 (#554)

Author: liuzicheng1987

CMakeLists.txt

@@ -332,9 +332,9 @@ if (REFLECTCPP_MSGPACK OR REFLECTCPP_CHECK_HEADERS)
         src/reflectcpp_msgpack.cpp
     )
     if (NOT TARGET msgpack-c)
-        find_package(msgpack-c CONFIG REQUIRED NAMES msgpack msgpack-c)
+        find_package(msgpack-c CONFIG REQUIRED NAMES msgpack msgpack-c msgpackc)
     endif()
-    target_link_libraries(reflectcpp PUBLIC msgpack-c)
+    target_link_libraries(reflectcpp PUBLIC $<IF:$<TARGET_EXISTS:msgpack-c>,msgpack-c,$<IF:$<TARGET_EXISTS:msgpackc>,msgpackc,msgpack-c>>)
 endif ()
 
 if (REFLECTCPP_PARQUET OR REFLECTCPP_CHECK_HEADERS)