revive Windows DLL versioning

[sophiapoirier]

Once upon a time, I had version metadata properly imbued into the Windows plugin DLLs using the file dfx-library/dfxplugin-version.rc. It could pre-process the *-def.h prefix header files (and relied on some macros defined in those to populate the version info), and so it would involve adding something like this into the win32/resource.rc files:

#include "geometer-def.h"
#include "../../dfx-library/visualstudio/dfxplugin-version.rc"

Perhaps if interested, you could see whether it might be easy enough to reintegrate this?