examples: Fix build after ecore_buffer commit.

Since 8b62177561 make examples fails to build
as the examples have been included without checking if ecore_buffer is
actually enabled to build.

make[2]: *** No rule to make target '../../../src/lib/ecore_buffer/libecore_buffer.la', needed by 'ecore_buffer_example'.  Stop.

I'm running make examples during the nightlies now in the hope to catch those.

src/examples/ecore/Makefile.am

@@ -8,7 +8,6 @@ AM_CPPFLAGS = \
 -I$(top_srcdir)/src/lib/eo \
 -I$(top_srcdir)/src/lib/evas \
 -I$(top_srcdir)/src/lib/ecore \
--I$(top_srcdir)/src/lib/ecore_buffer \
 -I$(top_srcdir)/src/lib/ecore_input \
 -I$(top_srcdir)/src/lib/ecore_input_evas \
 -I$(top_srcdir)/src/lib/ecore_file \
@@ -34,11 +33,12 @@ AM_CPPFLAGS = \
 -DPACKAGE_EXAMPLES_DIR=\".\" \
 @ECORE_CFLAGS@
 
+if HAVE_ECORE_BUFFER
+AM_CPPFLAGS += -I$(top_srcdir)/src/lib/ecore_buffer
+endif
+
 EXTRA_PROGRAMS = \
 ecore_animator_example \
-ecore_buffer_example \
-ecore_buffer_consumer_example \
-ecore_buffer_provider_example \
 ecore_client_bench \
 ecore_compose_get_example \
 ecore_con_client_example \
@@ -116,6 +116,11 @@ $(ECORE_COMMON_LDADD)
 ecore_animator_example_SOURCES = ecore_animator_example.c
 ecore_animator_example_LDADD = $(ECORE_EVAS_COMMON_LDADD)
 
+if HAVE_ECORE_BUFFER
+EXTRA_PROGRAMS += ecore_buffer_example \
+ecore_buffer_consumer_example \
+ecore_buffer_provider_example
+
 ecore_buffer_example_SOURCES = ecore_buffer_example.c
 ecore_buffer_example_LDADD = $(ECORE_EVAS_COMMON_LDADD) \
                              $(top_builddir)/src/lib/ecore_buffer/libecore_buffer.la
@@ -127,6 +132,7 @@ ecore_buffer_consumer_example_LDADD = $(ECORE_EVAS_COMMON_LDADD) \
 ecore_buffer_provider_example_SOURCES = ecore_buffer_provider_example.c
 ecore_buffer_provider_example_LDADD = $(ECORE_EVAS_COMMON_LDADD) \
                              $(top_builddir)/src/lib/ecore_buffer/libecore_buffer.la
+endif
 
 ecore_client_bench_SOURCES = ecore_client_bench.c
 ecore_client_bench_LDADD = $(ECORE_CON_COMMON_LDADD)