[libsigc++2/variadic] Remove code that used the SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD ifndefs.

[Murray Cumming <murrayc src gnome org>]

commit ca22594541ae4b85ff95b40d283e95295b1c376e
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Jan 14 13:13:19 2016 +0100

    Remove code that used the SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD ifndefs.
    
    See the previous commit.

 sigc++/adaptors/adaptor_trait.h |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/sigc++/adaptors/adaptor_trait.h b/sigc++/adaptors/adaptor_trait.h
index 8c46ffb..a9b2a72 100644
--- a/sigc++/adaptors/adaptor_trait.h
+++ b/sigc++/adaptors/adaptor_trait.h
@@ -38,11 +38,7 @@ namespace sigc {
 #ifdef SIGC_GCC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
   #define SIGC_WORKAROUND_OPERATOR_PARENTHESES template operator()
 #else
-  #ifdef SIGC_MSVC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
     #define SIGC_WORKAROUND_OPERATOR_PARENTHESES operator()
-  #else
-    #define SIGC_WORKAROUND_OPERATOR_PARENTHESES sun_forte_workaround
-  #endif
 #endif