Fix #287 (problem extracting some archives created on windows)
Fix #287 (problem extracting some archives created on windows)

The cause of this problem remains unknown, but I verified that the hash of the
generated tarball is the same as the downloaded tarball that we pass to the
tarfile module (so there is definitely no corruption in transit).

BlackstoneEngineering/yotta,stevenewey/yotta,theotherjimmy/yotta,eyeye/yotta,iriark01/yotta,ntoll/yotta,BlackstoneEngineering/yotta,autopulated/yotta,stevenewey/yotta,eyeye/yotta,autopulated/yotta,ARMmbed/yotta,iriark01/yotta,ntoll/yotta,theotherjimmy/yotta,ARMmbed/yotta