Alex Richardson authored May 13, 2022 and Alex Richardson committed May 14, 2022

Otherwise the build fails for me with the following error:
error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
Upstream does not appear willing to fix this issue, so we have to add a
define to avoid usage of this useless keyword.
See https://github.com/mm2/Little-CMS/issues/190 and
https://github.com/mm2/Little-CMS/issues/243.