update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# Locally computed:
sha256  d3be5c6eec24950cb3bd67dbfbcdf036f1278fae5fd78655ef8cdf9e911e428a  dmalloc-5.5.2.tgz
sha256  8659d49ceeeb006288ad246164e504ccfe33f7a4c1680439fb6ff6a393b0722b  dmalloc.h.1