Add msgpackc to the NAMES; fixes #551 #374

Job	Run time
windows-msvc-shared (AVRO)	7m 17s
windows-msvc-shared (FLEXBUFFERS)	6m 33s
windows-msvc-shared (CBOR)	7m 54s
windows-msvc-shared (JSON)	10m 14s
windows-msvc-shared (CAPNPROTO)	7m 34s
windows-msvc-shared (MSGPACK)	3m 50s
windows-msvc-shared (XML)	3m 45s
windows-msvc-shared (TOML)	3m 49s
windows-msvc-shared (PARQUET)	39m 38s
windows-msvc-shared (YAML)	4m 11s
windows-msvc-shared (UBJSON)	7m 50s
windows-msvc (benchmarks)	23m 36s
windows-msvc (YAML)	4m 17s
windows-msvc (PARQUET)	23m 37s
windows-msvc (JSON)	11m 9s
windows-msvc (TOML)	3m 37s
windows-msvc (FLEXBUFFERS)	5m 47s
windows-msvc (UBJSON)	6m 46s
windows-msvc (AVRO)	6m 57s
windows-msvc (CAPNPROTO)	8m 34s
windows-msvc (MSGPACK)	3m 56s
windows-msvc (XML)	4m 15s
windows-msvc (CBOR)	9m 17s
	3h 34m 23s

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