RFR: 8333477: Delete extra empty spaces in Makefiles

[SendaoYan]

Hi all,
  This PR several extra empty spaces and extra empty lines in several Makefiles. It's trivial fix, no risk.

Thanks.

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Commit messages:
 - 8333477: Delete extra empty spaces in Makefiles

Changes: https://git.openjdk.org/jdk/pull/19537/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19537&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333477
  Stats: 9 lines in 4 files changed: 0 ins; 1 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/19537.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19537/head:pull/19537

PR: https://git.openjdk.org/jdk/pull/19537