matplotlib: fix build
#2350
| Job | Run time |
|---|---|
| 24s | |
| 28s | |
| 10m 23s | |
| 21m 35s | |
| 42m 14s | |
| 12m 40s | |
| 17m 45s | |
| 11m 45s | |
| 1h 16m 57s | |
| 11m 14s | |
| 22m 50s | |
| 12m 41s | |
| 17m 54s | |
| 55m 4s | |
| 17m 4s | |
| 29m 8s | |
| 17m 13s | |
| 14m 55s | |
| 24m 13s | |
| 2m 25s | |
| 22m 42s | |
| 2m 39s | |
| 2m 2s | |
| 42m 1s | |
| 26m 33s | |
| 2m 42s | |
| 2m 45s | |
| 2m 20s | |
| 2m 46s | |
| 2m 18s | |
| 2m 16s | |
| 2m 40s | |
| 2m 12s | |
| 2m 7s | |
| 3m 28s | |
| 2m 47s | |
| 2m 29s | |
| 3m 30s | |
| 11m 40s | |
| 12s | |
| 9h 21m 1s |