Do not set FLTK_PLATFORM_DEPENDENT_LIBS to contain win32 libraries. Cygwin builds should use the fltk that comes with Cygwin.
This adds copyright/license notification blocks CMake's find-modules. Many of the modules had no notices at all. Some had notices referring to the BSD license already. This commit normalizes existing notices and adds missing notices.
Yaakov Selkowitz
Todd Gamblin
Brad King
Bill Hoffman