Plug a potential memory leak as well.

string_binding is of type "const WCHAR *" so we shouldn't be calling
strlen on it, we should be calling strlenW on it.

These are now constructed automatically from the major, minor, build
and platform ID numbers defined in version.h.

wine_common_ver.rc: Allow the file version number and string to be automatically constructed from major, minor, build and platform ID numbers.