[jdk11u-dev] RFR: 8215635: Pandoc check in Docs.gmk does not work on Windows

[George Adams]

patch applies cleanly - prerequisite to https://github.com/openjdk/jdk/commit/4f45b5f9739e5a5e7d1c4f80da9c42e0d77dd0bf

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Depends on: https://git.openjdk.org/jdk11u-dev/pull/1312

Commit messages:
 - Backport 9f1d035d8d862fc0e827c1df7e34f4b4c062c6a1

Changes: https://git.openjdk.org/jdk11u-dev/pull/1313/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1313&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8215635
  Stats: 10 lines in 4 files changed: 8 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1313.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1313/head:pull/1313

PR: https://git.openjdk.org/jdk11u-dev/pull/1313