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/test/Makefile.am b/test/Makefile.am
index 45dab5f..d728099 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -21,6 +21,7 @@
 					$(SYSTEMD_CFLAGS) \
 					$(SDBUSPLUS_CFLAGS) \
 					$(SDEVENTPLUS_CFLAGS) \
+					$(STDPLUS_CFLAGS) \
 					$(PHOSPHOR_LOGGING_CFLAGS) \
 					$(PHOSPHOR_DBUS_INTERFACES_CFLAGS)
 
@@ -29,6 +30,7 @@
 					$(SYSTEMD_LIBS) \
 					$(SDBUSPLUS_LIBS) \
 					$(SDEVENTPLUS_LIBS) \
+					$(STDPLUS_LIBS) \
 					$(PHOSPHOR_LOGGING_LIBS) \
 					$(PHOSPHOR_DBUS_INTERFACES_LIBS)