remove std::experimental usage

All of the std::experimental usages in this repository have a well
supported counterpart in std as of C++17.  Switch to use them.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4cdf5cd27053ce85c7f70c215ee9456f96f79f42
diff --git a/src/Makefile.am b/src/Makefile.am
index bac980e..3be2e32 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,8 +21,7 @@
 	$(SDEVENTPLUS_LIBS) \
 	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
 	$(PHOSPHOR_LOGGING_LIBS) \
-	$(PHOSPHOR_SNMP_LIBS) \
-	-lstdc++fs
+	$(PHOSPHOR_SNMP_LIBS)
 phosphor_dbus_monitor_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(SDEVENTPLUS_CFLAGS) \