Print vars for debug. #519

Job	Run time
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1m 52s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1m 30s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1m 44s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	5m 53s
mmg-debug / ci (macos-12, on, off, on, off, int32_t)	3m 5s
mmg-debug / ci (macos-12, on, off, off, off, int32_t)	2m 18s
mmg-debug / ci (macos-12, off, off, on, off, int32_t)	2m 29s
mmg-debug / ci (macos-12, off, off, off, off, int32_t)	2m 44s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	3m 13s
mmg-debug / ci (macos-12, off, off, off, on, int32_t)	6m 23s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1m 47s
mmg-debug / ci (macos-12, off, on, on, off, int32_t)	3m 5s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	4s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	4s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	3s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	2m 52s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	2m 40s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	1m 32s
mmg-debug / ci (macos-12, on, on, on, on, int64_t)	4m 36s
mmg-debug / ci (macos-12, off, off, off, off, int64_t)	35s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	3s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	3s
	48m 35s

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