Re: windowscodecs: Workaround libtiff bug when it defines toff_t as 32-bit for 32-bit builds. Take 2.

[Vincent Povirk]

There's a TIFF_VERSION define that seems to have been renamed to
TIFF_VERSION_CLASSIC in 4.0.

It doesn't make sense to do the check at runtime, given we're only
going to link to one of the versions.