[libsigcplusplus] examples build: Disable deprecated API.

[Murray Cumming <murrayc src gnome org>]

commit a0618ed5031596458c3b41ed286489239e30e57d
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Mar 10 17:17:16 2016 +0100

    examples build: Disable deprecated API.

 examples/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/examples/Makefile.am b/examples/Makefile.am
index b77cc24..121f547 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -16,7 +16,7 @@
 ## along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 AM_CPPFLAGS = -I$(top_builddir) -I$(top_srcdir)
-AM_CXXFLAGS = $(SIGC_WXXFLAGS)
+AM_CXXFLAGS = $(SIGC_WXXFLAGS) -DSIGCXX_DISABLE_DEPRECATED
 LDADD       = $(top_builddir)/sigc++/libsigc-$(SIGCXX_API_VERSION).la
 
 noinst_PROGRAMS = hello_world member_method