FLTK 1.1.0 for Mac "Out Of The Box Experience": type 'make' and watch...

- updated configure.in and Makefiles to support Darwin (Mac OS X BSD
  environment)


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1813 ea41ed52-d2ee-0310-a9c1-e6b18d33e121