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/test/Makefile.am b/src/test/Makefile.am
index 9314049..0faa765 100644
--- a/src/test/Makefile.am
+++ b/src/test/Makefile.am
@@ -197,8 +197,7 @@
 	$(builddir)/../elog.o \
 	$(builddir)/../resolve_errors.o \
 	$(builddir)/../event_manager.o \
-	$(builddir)/../event_serialize.o \
-	-lstdc++fs
+	$(builddir)/../event_serialize.o
 
 check_PROGRAMS += interfaceaddtest
 interfaceaddtest_SOURCES = \