RFR: 8321802: (zipfs) Add validation of incorrect LOC signature in ZipFileSystem

[Eirik Bjorsnos]

Please review this PR which adds validation of incorrect LOC signatures in `ZipFileSystem`.

`ZipFile` already rejects the case where the  offset pointed to from the CEN header does not start with the expected LOC signature. It makes sense to add this check to `ZipFileSystem` as well.

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Commit messages:
 - Vaidate that LOC offset pointed to from the CEN actually starts with the expected LOC signature

Changes: https://git.openjdk.org/jdk/pull/17059/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17059&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321802
  Stats: 14 lines in 2 files changed: 13 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17059.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17059/head:pull/17059

PR: https://git.openjdk.org/jdk/pull/17059