[libsigcplusplus] Remove unnecessary signal.cc file.

[Murray Cumming <murrayc src gnome org>]

commit 733fc1cb6e4295ee0e1369163c00f6af0da12e29
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 14:37:30 2016 +0200

    Remove unnecessary signal.cc file.

 sigc++/CMakeLists.txt |    1 -
 sigc++/Makefile.am    |    1 -
 sigc++/signal.cc      |   25 -------------------------
 3 files changed, 0 insertions(+), 27 deletions(-)
---
diff --git a/sigc++/CMakeLists.txt b/sigc++/CMakeLists.txt
index d0dc69c..c06d829 100644
--- a/sigc++/CMakeLists.txt
+++ b/sigc++/CMakeLists.txt
@@ -17,7 +17,6 @@
 set (SOURCE_FILES
        connection.cc
        signal_base.cc
-       signal.cc
        trackable.cc
        functors/slot_base.cc
 )
diff --git a/sigc++/Makefile.am b/sigc++/Makefile.am
index 79aa4bd..a61cc1f 100644
--- a/sigc++/Makefile.am
+++ b/sigc++/Makefile.am
@@ -30,7 +30,6 @@ nobase_library_include_HEADERS = sigc++.h $(sigc_public_h) $(sigc_built_h)
 lib_LTLIBRARIES = libsigc- SIGCXX_API_VERSION@.la
 
 libsigc_ SIGCXX_API_VERSION@_la_SOURCES =      \
-       signal.cc                               \
        signal_base.cc                          \
        trackable.cc                            \
        connection.cc                           \