RFR: 8336941 : Update libxslt to 1.1.42

[Hima Bindu Meda]

Updated libxslt to v1.1.42. Verified build on all platforms. No issue seen

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Commit messages:
 - Update libxslt to v1.1.42

Changes: https://git.openjdk.org/jfx/pull/1527/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1527&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336941
  Stats: 288 lines in 18 files changed: 111 ins; 126 del; 51 mod
  Patch: https://git.openjdk.org/jfx/pull/1527.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1527/head:pull/1527

PR: https://git.openjdk.org/jfx/pull/1527