update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# locally computed
sha256  db7390a13e7c0426894a6f966ecde1f89e6566416088c50729750e800306a2de  on2-8170-libs-1.0.tar.gz