Windows CMake, multiple copies of libffi-6.dll

[Graham Bloice <graham.bloice () trihedral com>]

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.

-- 
Graham Bloice

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