Add t/dynpmc/*.t to @library_tests.

Why the tests in t/dynpmc/ were absent from @library_tests is unclear.
Including them in @library_tests will cause them to be run in 'make test'
and many other testing targets.

lib/Parrot/Harness/DefaultTests.pm

@@ -86,6 +86,7 @@ our @EXPORT_OK = qw(
     t/compilers/opsc/*.t
     t/compilers/data_json/*.t
     t/dynoplibs/*.t
+    t/dynpmc/*.t
     t/library/*.t
     t/tools/*.t
     t/profiling/*.t