(20221122) and change the import approach to the same one we use for
Streamlined NTRUPrime: use a shell script to extract the bits we need from
SUPERCOP, make some minor adjustments and squish them all into a single file.
ok tb@ tobhe@
OpenBSD-Commit-ID: 1bc0fd624cb6af440905b8ba74ac7c03311b8e3b
djm@openbsd.org