Update lang/perl58 to perl-5.8.6. Selected hanges from version 5.8.5

include:

* By default, platforms that have native threads will build a threaded
  perl.  Note that you will likely have to rebuild your Perl modules
  after this update unless your Perl is already threaded.

* The perl interpreter is now more tolerant of UTF-16-encoded scripts.
* Several core modules were updated.
* Perl has a new -dt command-line flag, which enables threads support in
  the debugger.

* "foreach" on threads::shared array used to be able to crash Perl. This
  bug has now been fixed.
* A regexp in "STDOUT"'s destructor used to coredump, because the regexp
  pad was already freed. This has been fixed.
* Using "delete" on an array no longer leaks memory. A "pop" of an item
  from a shared array reference no longer causes a leak.
* "eval_sv()" failing a taint test could corrupt the stack - this has
  been fixed.
* On platforms with 64 bit pointers numeric comparison operators used to
  erroneously compare the addresses of references that are overloaded,
  rather than using the overloaded values. This has been fixed.
* From now on all applications embedding perl will behave as if perl were
  compiled with -DPERL_USE_SAFE_PUTENV.

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