RFR: 8313374: --enable-ccache's CCACHE_BASEDIR breaks builds

[Jan Kratochvil]

https://bugs.openjdk.org/browse/JDK-8313374
--enable-ccache's CCACHE_BASEDIR breaks builds

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Commit messages:
 - 8313374: --enable-ccache's CCACHE_BASEDIR breaks builds

Changes: https://git.openjdk.org/jdk/pull/15080/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15080&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313374
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15080.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15080/head:pull/15080

PR: https://git.openjdk.org/jdk/pull/15080