main: use sdeventplus wrapper

Convert sdevent to new C++ library wrappers.

Tested: ran on hardware platform and observed snooper able to collect
POST codes. Unit tests still pass.

Change-Id: Ic69a41fc20dd77595f065600633a1dcfafd44a5a
Signed-off-by: Kun Yi <kunyi@google.com>
diff --git a/Makefile.am b/Makefile.am
index 890eddf..4bfdd86 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,8 +3,8 @@
 sbin_PROGRAMS = snoopd snooper
 
 snoopd_SOURCES = main.cpp
-snoopd_LDADD = $(SDBUSPLUS_LIBS) $(PHOSPHOR_DBUS_INTERFACES_LIBS) -lpthread
-snoopd_CXXFLAGS = $(SDBUSPLUS_CFLAGS) $(PHOSPHOR_DBUS_INTERFACES_CFLAGS)
+snoopd_LDADD = $(SDBUSPLUS_LIBS) $(SDEVENTPLUS_LIBS) $(PHOSPHOR_DBUS_INTERFACES_LIBS) -lpthread
+snoopd_CXXFLAGS = $(SDBUSPLUS_CFLAGS) $(SDEVENTPLUS_CFLAGS) $(PHOSPHOR_DBUS_INTERFACES_CFLAGS)
 
 snooper_SOURCES = example.cpp
 snooper_LDADD = $(SDBUSPLUS_LIBS) $(PHOSPHOR_DBUS_INTERFACES_LIBS)