Windows CMake always copies libffi-6.dll into the runtime directory, because it's found in two places in the support libraries, gnutls and gtk2. The version from gnutls is copied first, then overwritten by the gtk2 version, then on the next build the same happens again. because both copies are triggered if the file is different.
Unfortunately, although the files are different sizes, neither has any resources embedded indicating version or build numbers to be able to determine which one is "best".
Does anyone know which one we should be using? Currently the gtk2 one is going out in builds, so seems to be OK.
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