Update to 4.5.1+ds-0.1

Theodore Tuckerrequested to merge
tti0/croaring-fork:theodore/4.5.1 into master

Towards https://bugs.debian.org/1122578

This MR updates the source and packaging of CRoaring to the latest upstream release tag v4.5.1 as a non-maintainer upload.

Edited by Theodore Tucker

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