Configurations/10-main.conf: fix VC-noCE-common template.

picker() is type agnostic, but its output consumer is not. Or rather
it doesn't work if picker() picks nothing when consumer expects
array. So ensure array is returned when array is expected.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5770)

Configurations/10-main.conf

@@ -1285,7 +1285,8 @@ my %targets = (
                                        sub {
                                            ($disabled{shared} ? "" : "/MD");
                                        })),
-        defines          => add(picker(debug   => [ "DEBUG", "_DEBUG" ])),
+        defines          => add(picker(default => [], # works as type cast
+                                       debug   => [ "DEBUG", "_DEBUG" ])),
         lib_cflags       => add(sub { $disabled{shared} ? "/MT /Zl" : () }),
         # Following might/should appears controversial, i.e. defining
         # /MDd without evaluating $disabled{shared}. It works in