openpower-debug-collector: use c++17

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

Change-Id: I0d4cf9922fdd22bf384bfc8140e201ff79e78e34
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/configure.ac b/configure.ac
index ca6d94e..8f4f3fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@
 AM_CONDITIONAL([INSTALL_ERROR_YAML], [test "x$enable_install_error_yaml" = "xyes"])
 AS_IF([test "x$enable_install_error_yaml" != "xyes"], [
     # 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])
 
     # Check for sdbus++