[PMC] Added a string_copy() missed in the previous two commits to Class PMC's get_string() vtable entry.
[PMC] Added a string_copy() missed in the previous two commits to Class PMC's
get_string() vtable entry.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@26935 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot