initial deprecation of multi_span and strided_span

tests/strided_span_tests.cpp

@@ -17,7 +17,7 @@
 #ifdef _MSC_VER
 // blanket turn off warnings from CppCoreCheck from catch
 // so people aren't annoyed by them when running the tool.
-#pragma warning(disable : 26440 26426) // from catch
+#pragma warning(disable : 26440 26426 4996) // from catch deprecated
 
 #endif