perl: Ignore internal_* functions in POD coverage test.

This updates commit 1d999540bd.

perl/t/006-pod-coverage.t

@@ -23,5 +23,6 @@ eval "use Test::Pod::Coverage 1.00";
 plan skip_all => "Test::Pod::Coverage 1.00 required for testing POD" if $@;
 all_pod_coverage_ok ({
     also_private => [ qr/^test0.*/,
-                      qr/^debug.*/ ]
+                      qr/^debug.*/,
+                      qr/^internal.*/ ]
 });