phosphor-debug-collector: use c++17

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

Change-Id: I3636e54a746c9f9312f5d01ac83113204ed78a46
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/configure.ac b/configure.ac
index 776c440..e108087 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,7 +36,7 @@
 LT_INIT # Required for systemd linking
 
 # 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], [CXXFLAGS])
 
 AC_ARG_VAR(DUMP_BUSNAME, [The Dbus busname to own])