• Fix : [RT #101410] : Install fails in blead
  Even though the change that caused this error was reverted from
  blead, lvalue uses of ERRSV have been removed from this module
  so that there will be no breakage when this change is possibly
  reintroduced in the following months.
  Thanks Dave Rolsky for reporting.
  
• Tst : $ENV{$Config{ldlibpthname}} is now preserved on all platforms,
  which will address failures of t/17-ctl.t with unusual
  compilers (like icc) that link all their compiled objects to
  their own libraries.
  
• Tst : The global destruction test is now only run on perl 5.13.4 and
  higher, and only if either Perl::Destruct::Level is installed
  or PERL_DESTRUCT_LEVEL is set and the perl is a debugging perl.
  This will solve rare crashes of t/15-self.t on perl 5.13.3 and
  older.