fldiff fails to start after updating fltk to 1.3.0

[Thomas Mueller]

After upgrading x11-toolkits/fltk from 1.1.10_1 to 1.3.0
textproc/fldiff fails to start:

  $ fldiff
  Shared object "libfltk_images.so.1.1" not found, required by "fldiff"

A rebuild of textproc/fldiff fixes that problem.

Perhaps ports depending on fltk should have their revision bumped or an
appropriate note on how to upgrade fltk should be added to UPDATING.

-- 
Thomas Mueller