Add support for deprecated::smartmatch in Test-Simple

This patch must be sent upstream.

Author: book

cpan/Test-Simple/t/Legacy/Regression/870-experimental-warnings.t

@@ -8,6 +8,7 @@ require Test::More;
 *cmp_ok = \&Test::More::cmp_ok;
 
 no warnings "experimental::smartmatch";
+no if $] >= 5.037005, warnings => "deprecated::smartmatch";
 
 my $warnings = warnings { cmp_ok(1, "~~", 1) };