Log message:
math: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Log message:
math: Remove SHA1 hashes for distfiles

Log message:
Add pcg version 0.94 to the packages collection

	The PCG family of Random Number Generators combines properties not
	previously seen together in the same generation scheme:

	+ It's really easy to use, and yet its very flexible and offers
	powerful features (including some that allow you to perform silly
	party tricks).

	+ It's very fast, and can occupy very little space.

	+ It has small code size.

	+ It's performance in statistical tests is excellent (see the PCG
	paper for full details).

	+ It's much less predictable and thus more secure than most generators.

	+ It's open source software, with a permissive license (the Apache license).