Add msgpackc to the NAMES; fixes #551 #380

Job	Run time
windows-msvc-shared (AVRO)	7m 17s
windows-msvc-shared (XML)	3m 59s
windows-msvc-shared (UBJSON)	6m 50s
windows-msvc-shared (TOML)	3m 53s
windows-msvc-shared (CAPNPROTO)	8m 26s
windows-msvc-shared (FLEXBUFFERS)	5m 23s
windows-msvc-shared (CBOR)	9m 17s
windows-msvc-shared (YAML)	4m 15s
windows-msvc-shared (PARQUET)	39m 25s
windows-msvc-shared (MSGPACK)	3m 44s
windows-msvc (PARQUET)	40m 10s
windows-msvc (TOML)	4m 28s
windows-msvc (XML)	4m 27s
windows-msvc (AVRO)	7m 49s
windows-msvc (UBJSON)	6m 54s
windows-msvc (benchmarks)	49m 28s
windows-msvc (CBOR)	8m 36s
windows-msvc (FLEXBUFFERS)	5m 25s
windows-msvc (YAML)	4m 25s
windows-msvc (JSON)	10m 52s
windows-msvc-shared (JSON)	10m 31s
windows-msvc (CAPNPROTO)	8m 0s
windows-msvc (MSGPACK)	3m 37s
	4h 17m 11s

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