Add CGo-free interp backend on linux#29

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jopbrown wants to merge 4 commits intovisualfc:masterfrom

jopbrown:purego

Commits on Jan 30, 2022

add modernc.org/tk backend to git rid of cgo
jopbrown
committed

Commits on Jan 31, 2022

update README
jopbrown
committed

Commits on Apr 30, 2022