matplotlib: fix build
#2351
| Job | Run time |
|---|---|
| 21s | |
| 26s | |
| 40m 58s | |
| 21m 36s | |
| 9m 39s | |
| 16m 36s | |
| 13m 3s | |
| 17m 16s | |
| 17m 9s | |
| 1h 7m 10s | |
| 34m 35s | |
| 17m 21s | |
| 25m 17s | |
| 58m 2s | |
| 2m 27s | |
| 2m 36s | |
| 2m 41s | |
| 2m 35s | |
| 2m 40s | |
| 2m 36s | |
| 2m 16s | |
| 2m 20s | |
| 2m 25s | |
| 2m 49s | |
| 2m 36s | |
| 1m 55s | |
| 3m 19s | |
| 2m 39s | |
| 1m 31s | |
| 1m 42s | |
| 13m 5s | |
| 26m 24s | |
| 17m 36s | |
| 25m 45s | |
| 17m 6s | |
| 30m 17s | |
| 32m 34s | |
| 14m 4s | |
| 11m 35s | |
| 11s | |
| 9h 27m 13s |