RFR: 8294456: Fix misleading-indentation warnings in JDK

[Raffaello Giulietti]

This fixes misleading indentations, which allows enabling the (currently disabled) `misleading-indentation` warning flag on two `.gmk` files.

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Commit messages:
 - 8294456: Fix misleading-indentation warnings in JDK

Changes: https://git.openjdk.org/jdk/pull/10487/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10487&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294456
  Stats: 9 lines in 4 files changed: 1 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/10487.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10487/head:pull/10487

PR: https://git.openjdk.org/jdk/pull/10487