zip_archive: reject files that don't start with an LFH signature. am: dbacd826a1 am: 368ec42fa8 am: 6dbd1db1cf am: 58c10b2ab9  -s ours am: 2dbba44e2d am: 583a11b339 am: 15d221c0ba am: 377f534697 am: 1cd5954ced am: 4168856cf2
am: 53f49bc4ec

Change-Id: I0d7d3740a510fad091025f1590d903dbadd54c04