[NTG-context] mtxrun initialization bug

I did a fresh install of the minimals today and observed a fleeting, obscure mtxrun bug: $ context myfile did not find the script mtx-context.lua $ mtxrun --script /usr/local/context/tex/texmf-context/\ scripts/context/lua/mtx-context.lua myfile ran fine, as now does all subsequent runs of "context myfile". So something gets initialized, but is not found by default. You will only notice this upon a (totally) fresh install. Alan