[MacPorts] #49061: Fltk does not build under 10.11

[MacPorts]

#49061: Fltk does not build under 10.11
---------------------------+--------------------------------
 Reporter:  jguillaumes@…  |      Owner:  macports-tickets@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.3.4
 Keywords:                 |       Port:  fltk
---------------------------+--------------------------------
 Compilation fails with this message:

 info:build
 /System/Library/Frameworks/CoreFoundation.framework/Headers/CFAvaila
 bility.h:110:45: note: expanded from macro '__CF_NAMED_ENUM'
 :info:build #define __CF_NAMED_ENUM(_type, _name) _type _name; enum
 :info:build                                             ^
 :info:build fl_line_style.cxx:115:15: error: elaborated type refers to a
 typedef
 :info:build   static enum CGLineJoin Join[4] = { kCGLineJoinMiter,
 kCGLineJoinMiter,
 :info:build               ^
 :info:build
 /System/Library/Frameworks/CoreGraphics.framework/Headers/CGPath.h:25:26:
 note: declared here
 :info:build typedef CF_ENUM(int32_t, CGLineJoin) {
 :info:bu

 For reference, it has also been reported in homebrew:

 https://github.com/Homebrew/homebrew/issues/41581

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Ticket URL: <https://trac.macports.org/ticket/49061>
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