util: Replace raw struct functions with stdplus

These functions were recently added to stdplus as they are useful across
projects.

Change-Id: Ia383715a253fce71dacc6bc72b1771393e8ed600
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/Makefile.am b/Makefile.am
index 3bb5e7b..3649ca8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -87,6 +87,7 @@
 		$(SYSTEMD_LIBS) \
 		$(SDBUSPLUS_LIBS) \
 		$(SDEVENTPLUS_LIBS) \
+		$(STDPLUS_LIBS) \
 		$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
 		$(PHOSPHOR_LOGGING_LIBS) \
 		-lstdc++fs
@@ -95,6 +96,7 @@
 		$(SYSTEMD_CFLAGS) \
 		$(SDBUSPLUS_CFLAGS) \
 		$(SDEVENTPLUS_CFLAGS) \
+		$(STDPLUS_CFLAGS) \
 		$(PHOSPHOR_DBUS_INTERFACES_CFLAGS) \
 		$(PHOSPHOR_LOGGING_CFLAGS) \
 		-flto