> Supposedly that can be disabled, reverting to the C interfaces,
> by building with "-tags nowasm", but the seemingly-obvious way
> to do that via setting MODGO_FLAGS doesn't work for me.

From the release notes, working without it is not supported, and 
tagging/scanning will take a performance hit.

There's some additional notes about the changes here:

https://github.com/sentriz/gonic/releases/tag/v0.19.0
> Your diff again below, with an additional tweak to PLIST so that
> "make plist" doesn't reorder it, and to avoid an unnecessary
> daemon-writable directory in /usr/local.

Thanks for the tweaks!