[libsigcplusplus/variadic_mem_fun3: 111/148] Don't include functor_trait.h where it is not used.

[Murray Cumming <murrayc src gnome org>]

commit b929ffe1808039f20493f4e16aa7844bf95c9ea2
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Mar 4 11:12:55 2016 +0100

    Don't include functor_trait.h where it is not used.

 sigc++/adaptors/adaptor_base.h      |    1 -
 sigc++/functors/macros/mem_fun.h.m4 |    1 -
 sigc++/functors/ptr_fun.h           |    1 -
 3 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/sigc++/adaptors/adaptor_base.h b/sigc++/adaptors/adaptor_base.h
index 97b6f68..8fda1e4 100644
--- a/sigc++/adaptors/adaptor_base.h
+++ b/sigc++/adaptors/adaptor_base.h
@@ -1,6 +1,5 @@
 #ifndef _SIGC_ADAPTORS_DEDUCE_RESULT_TYPE_H_
 #define _SIGC_ADAPTORS_DEDUCE_RESULT_TYPE_H_
-#include <sigc++/functors/functor_trait.h>
 
 namespace sigc {
 
diff --git a/sigc++/functors/macros/mem_fun.h.m4 b/sigc++/functors/macros/mem_fun.h.m4
index ffc0ab6..3f4fd6b 100644
--- a/sigc++/functors/macros/mem_fun.h.m4
+++ b/sigc++/functors/macros/mem_fun.h.m4
@@ -188,7 +188,6 @@ divert(0)
 //    to have automatic conversion for member pointers.
 _FIREWALL([FUNCTORS_MEM_FUN])
 #include <sigc++/type_traits.h>
-#include <sigc++/functors/functor_trait.h>
 #include <sigc++/limit_reference.h>
 
 namespace sigc {
diff --git a/sigc++/functors/ptr_fun.h b/sigc++/functors/ptr_fun.h
index 9242f29..9eab18a 100644
--- a/sigc++/functors/ptr_fun.h
+++ b/sigc++/functors/ptr_fun.h
@@ -1,7 +1,6 @@
 #ifndef _SIGC_FUNCTORS_PTR_FUN_H_
 #define _SIGC_FUNCTORS_PTR_FUN_H_
 #include <sigc++/type_traits.h>
-#include <sigc++/functors/functor_trait.h>
 
 namespace sigc {