Tests: Teach RunCMake.SymlinkTrees to tolerate CCACHE_BASEDIR
If the test is driven with a ccache-wrapped compiler then
the CCACHE_BASEDIR environment variable might break paths
the test checks.
Fixes: #23885 (closed)
Backport: release
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If the test is driven with a ccache-wrapped compiler then
the CCACHE_BASEDIR environment variable might break paths
the test checks.
Fixes: #23885 (closed)
Backport: release