Remove redundant source code from go runtime#4155

Merged

parrt merged 2 commits intoantlr:devfrom

jimidle:feature/v4cleanup

Mar 5, 2023

Commits on Mar 5, 2023

feat: Remove the old version of the source code, as at v4.x.y the source must be under /v4 for modules
jimidle
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fix: tidy up old version of go.mod (non v4 version), which is now deprecated
jimidle
committed