#21 ActiveTcl 8.4.11 no longer set specFlags

[goodegod]

There is an error creating a text marker in BLT
compiled with ActiveTcl 8.4.11 (also 8.5 beta). It
appears that the specFlags are no longer being set by
Tk_ConfigureWidget, so calls to Blt_ConfigModified
will never return 1.

This is easy to reproduce. Create a graph, and try
to create a text marker.