[lworld] RFR: 8335772: [lworld] fix for JDK-8335641 should have added some classes to GensrcValueClasses.gmk

[Vicente Romero]

simple fix modifying GensrcValueClasses.gmk so that we can generate the following classes as value classes:

    java.time.chrono.ChronoLocalDateImpl
    java.time.chrono.MinguoDate
    java.time.chrono.HijrahDate
    java.time.chrono.JapaneseDate
    java.time.chrono.ThaiBuddhistDate

TIA

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Commit messages:
 - fixing bug
 - Merge branch 'lworld' into JDK-8335772
 - 8335772: [lworld] fix for JDK-8335641 should have added some classes to GensrcValueClasses.gmk

Changes: https://git.openjdk.org/valhalla/pull/1162/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1162&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335772
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1162.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1162/head:pull/1162

PR: https://git.openjdk.org/valhalla/pull/1162