Document that fl_line_style() must be called after fl_color() on WIN32

systems (at least) since fl_color() will destroy the extended pen
created by fl_line_style().


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@1433 ea41ed52-d2ee-0310-a9c1-e6b18d33e121