Link with liblzma when using built-in libtiff if it's available.

New version of libtiff includes code using liblzma if it's available, so we
need to link with it in this case.

Closes #14963.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74033 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775