Fixes warnings like
blake2.h(140): warning C4804: '/': unsafe use of type 'bool' in operation
blake2.h(141): warning C4804: '/': unsafe use of type 'bool' in operation
NOTE! The NEON version of blake2s is currently NO FASTER than the
reference implementations. However, it is retained for reference
and in case it can be further improved.
The NEON version of blake2b is more than twice as fast as the
reference implementation on the Raspberry PI 2 Model B.