RFR: 8328079: JDK-8326583 broke ccache compilation

Wed Mar 13 12:55:32 UTC 2024

According to https://github.com/openjdk/jdk/pull/17986#issuecomment-1975396416, [JDK-8326583](https://bugs.openjdk.org/browse/JDK-8326583) broke ccache compilation.

The reason was that the ccache command line included `CCACHE_SLOPPINESS=pch_defines,time_macros`, and the comma was expanded wrongly, causing `time_macros ...` to look as an additional argument to `SetIfEmpty`.

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Commit messages:
 - 8328079: JDK-8326583 broke ccache compilation

Changes: https://git.openjdk.org/jdk/pull/18273/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18273&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328079
  Stats: 24 lines in 1 file changed: 0 ins; 0 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/18273.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18273/head:pull/18273

PR: https://git.openjdk.org/jdk/pull/18273