phosphor-inventory-manager: use c++17

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

Change-Id: Ib2437abc26c9e1a0b177e3f95c73dd61ceb468b8
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/configure.ac b/configure.ac
index b703403..4a21e8f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging],, AC_MSG_ERROR(["Requires phosphor-logging."]))
 
 # Checks for typedefs, structures, and compiler characteristics.
-AX_CXX_COMPILE_STDCXX_14([noext])
+AX_CXX_COMPILE_STDCXX_17([noext])
 AX_APPEND_COMPILE_FLAGS([-fpic -Wall -Werror], [CXXFLAGS])
 
 # Checks for header files.