Linux builds fail: no rsync

[hugovk]

Since turning on cron builds a couple of days ago, the Linux jobs are failing. They were passing when the last changes were pushed on 1st January. (MacOS passed before and pass now.)

Dependencies are failing to build because a missing rsync fails to fetch the zip files.

/io/multibuild/common_utils.sh: line 107: rsync: command not found
/io/multibuild/library_builders.sh: line 99: cd: jpeg-9b: No such file or directory

https://travis-ci.org/python-pillow/pillow-wheels/jobs/347228468#L527

[matthew-brett]

Try updating to the latest multibuild - we worked around this. It's a change in the manylinux docker image.

[radarhere]

For anyone looking at this issue, there is a conversation about this problem at #78 (comment)