Display known components in config command output

Author: Geoffrey Broadwell

bench

@@ -19,9 +19,10 @@ my $COMPONENTS = from-json(slurp "$PROGRAM_DIR/components.json");
 
 #= Show benchmark configuration
 multi MAIN ('config') {
-    say "Benchmark root:  $PROGRAM_DIR";
-    say "Perl 6 program:  $*EXECUTABLE_NAME";
-    say "Perl 6 version:  $*PERL<compiler>< name ver build-date >";
+    say "Benchmark root:    $PROGRAM_DIR";
+    say "Perl 6 program:    $*EXECUTABLE_NAME";
+    say "Perl 6 version:    $*PERL<compiler>< name ver build-date >";
+    say "Known components:  $COMPONENTS.keys.sort.join(', ')";
 }
 
 #= Prepare for mass benchmarking