Make clang tidy 'seen' cache dependent on changes in configuration.
Make clang tidy 'seen' cache dependent on changes in configuration.

Whenever the clang-tidy configuration changes, make sure that we
re-process all files by including the configuration into the
content hash creation.

Signed-off-by: Henner Zeller <e393654266408b751fd8ad27b99ca78813d38e23@google.com>

chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible