Find what is causing a ~ folder to be created in the Jenkins workspace

[larkost]

Something is creating ~ folders inside the workspace, and inside that there is an empty Library/Logs/CoreSimulator/CoreSimulator.log file. I don't think that this is really causing any problems, but there is probably some code not quite doing what it thinks it is somewhere that should be fixed.

[bdash]

Presumably due to this: https://github.com/realm/realm-cocoa/blob/965c136486c1eb88a217327a76bc9701b9ad803f/build.sh#L1072-L1074