sdevent: Remove in favor of sdeventplus

This change removes the one off sd-event wrapper from the project and
uses the openbmc wide sdeventplus library.

Change-Id: I8e042f875d06082e15606c7191a8073974f93990
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/configure.ac b/configure.ac
index 7209565..1ff3c65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,6 +18,7 @@
 
 # Checks for libraries.
 PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus],, AC_MSG_ERROR(["Requires sdbusplus package."]))
+PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus],, AC_MSG_ERROR(["Requires sdeventplus package."]))
 PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces],, AC_MSG_ERROR(["Requires phosphor-dbus-interfaces package."]))
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging],, AC_MSG_ERROR(["Requires phosphor-logging."]))
 PKG_CHECK_MODULES([PHOSPHOR_SNMP], [phosphor-snmp],, AC_MSG_ERROR(["Requires phosphor-snmp."]))