upset errors for libtiff*

[Christopher Faylor]

upset: *** setup.ini: warning - package libtiffxx-devel refers to non-existent external-source: tiff
upset: *** setup.ini: warning - package libtiffxx-devel refers to non-existent external-source: tiff
upset: *** setup.ini: warning - package libtiffxx5 refers to non-existent external-source: tiff
upset: *** setup.ini: warning - package libtiffxx5 refers to non-existent external-source: tiff

Remember that external-source only works for source packages which are
part of the distribution.  The libtiffxx* packages refer to versions which
exist in the tiff directory but are not found in setup.ini.

cgf