phosphor-dbus-interfaces: use c++17

Update configure.ac to choose the c++17 standard

Change-Id: I519d938138c35fe53354b1505c12b02aee1e3f75
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/configure.ac b/configure.ac
index 92b9b73..cbdc1f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,7 +32,7 @@
     AX_PKG_CHECK_MODULES([SDBUSPLUS], [], [sdbusplus], [], [AC_MSG_ERROR(["sdbusplus required and not found."])])
 
     # Checks for typedefs, structures, and compiler characteristics.
-    AX_CXX_COMPILE_STDCXX_14([noext])
+    AX_CXX_COMPILE_STDCXX_17([noext])
     AX_APPEND_COMPILE_FLAGS([-Wall -Werror], [CFLAGS])
     AX_APPEND_COMPILE_FLAGS([-Wall -Werror], [CXXFLAGS])