[vectorIntrinsics] RFR: 8253319: jcheck merge check is too strict

[Paul Sandoz]

Use the same configuration as that for panama-foreign:
https://github.com/openjdk/panama-foreign/blob/foreign-jextract/.jcheck/conf

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Commit messages:
 - Update jcheck conf

Changes: https://git.openjdk.java.net/panama-vector/pull/5/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=5&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253319
  Stats: 26 lines in 1 file changed: 24 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/5.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/5/head:pull/5

PR: https://git.openjdk.java.net/panama-vector/pull/5