[libsigcplusplus] Remove unnecessary slot.cc file.

[Murray Cumming <murrayc src gnome org>]

commit 8ef6986af7e6150af9d8082d1608423326d971a9
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 14:34:25 2016 +0200

    Remove unnecessary slot.cc file.

 sigc++/CMakeLists.txt   |    1 -
 sigc++/Makefile.am      |    1 -
 sigc++/functors/slot.cc |   25 -------------------------
 3 files changed, 0 insertions(+), 27 deletions(-)
---
diff --git a/sigc++/CMakeLists.txt b/sigc++/CMakeLists.txt
index f203d51..d0dc69c 100644
--- a/sigc++/CMakeLists.txt
+++ b/sigc++/CMakeLists.txt
@@ -20,7 +20,6 @@ set (SOURCE_FILES
        signal.cc
        trackable.cc
        functors/slot_base.cc
-       functors/slot.cc
 )
 
 set (SIGCPP_LIB_NAME sigc-${SIGCXX_API_VERSION})
diff --git a/sigc++/Makefile.am b/sigc++/Makefile.am
index 5fc6a20..79aa4bd 100644
--- a/sigc++/Makefile.am
+++ b/sigc++/Makefile.am
@@ -34,7 +34,6 @@ libsigc_ SIGCXX_API_VERSION@_la_SOURCES =     \
        signal_base.cc                          \
        trackable.cc                            \
        connection.cc                           \
-       functors/slot.cc                        \
        functors/slot_base.cc
 
 EXTRA_libsigc_ SIGCXX_API_VERSION@_la_SOURCES = $(sigc_built_cc)