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

[Murray Cumming <murrayc src gnome org>]

commit 801d33d014498a3698be69617effdefc4fcddb6c
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 14:34:25 2016 +0200

    Remove unnecessary slot.cc file.

 sigc++/Makefile.am      |    1 -
 sigc++/functors/slot.cc |   25 -------------------------
 2 files changed, 0 insertions(+), 26 deletions(-)
---
diff --git a/sigc++/Makefile.am b/sigc++/Makefile.am
index caa9e15..2bd871e 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                   \
        adaptors/lambda/lambda.cc