The file header returned by jar.ManifestFileContents had unset
date and mode fields. The unset date field resulted in the
"Last Mod Time" field in the zip file being set to 0, which
OpenJDK 9's jar implementation treats as an error:
java.time.DateTimeException: Invalid value for MonthOfYear (valid values 1 - 12): 0
Bug: 67095392
Test: zipdetails out/host/linux-x86/framework/tradefed.jar
Change-Id: I0a818d57420f5e5de57e8ff57791951c1b538443
Jar always puts default MANIFEST.MF files in if none was specified.
Copying that behavior in soong_zip causes problems with merge_zips,
because it ends up taking the default manifest from the classes.jar
instead of the user's manifest from res.jar. We don't want the
user's manifest in the classes.jar, otherwise a change to the
manifest will cause all the class files to rebuild. Instead,
move the manifest insertion to the final merge_zips stage.
Test: m -j checkbuild
Change-Id: Id6376961dbaf743c2fb92843f9bdf2e44b963be0
