[libsigcplusplus/libsigc++-2-10] Remove unnecessary signal.cc file.

[Murray Cumming <murrayc src gnome org>]

commit 67c84a3b0fb642ec043502e5bcc154210e9281be
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 14:37:30 2016 +0200

    Remove unnecessary signal.cc file.

 sigc++/Makefile.am |    1 -
 sigc++/signal.cc   |   25 -------------------------
 2 files changed, 0 insertions(+), 26 deletions(-)
---
diff --git a/sigc++/Makefile.am b/sigc++/Makefile.am
index 2bd871e..4fc2e06 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                           \