RFR: 8318388: Update libxslt to 1.1.39

[Hima Bindu Meda]

Updated libxslt to v1.1.39. Verified build on all platforms.No issue seen.

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Commit messages:
 - white space corrections
 - update version info in libxslt.md
 - configure libxslt on linux
 - configure libxslt on windows
 - update libxslt to v1.1.39

Changes: https://git.openjdk.org/jfx/pull/1298/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1298&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318388
  Stats: 2568 lines in 49 files changed: 979 ins; 1158 del; 431 mod
  Patch: https://git.openjdk.org/jfx/pull/1298.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1298/head:pull/1298

PR: https://git.openjdk.org/jfx/pull/1298