header file in the correct order, before anything written by an later
object in the fl file. It used to write the extern callback definitions
first, this would fail if they used a type that was in the header file.
This also simplified the (still messy) code by getting rid of the
write_declare() virtual function.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@637 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Bill Spitzak