[ZIP] Fix a crash when encountering non well-formed Extended Timestamp
[ZIP] Fix a crash when encountering non well-formed Extended Timestamp

ZIP files produced by Finder on certain versions of macOS sometimes contain incorrect Extended Timestamp extra field in their Central Directory. When trying to open such files, SWCompression was crashing. This change makes SWCompression ignore "incorrectness" in Extended Timestamp.

tsolomko/SWCompression,tsolomko/SWCompression,tsolomko/SWCompression