Bug#787453: libdata-alias-perl: FTBFS with perl 5.22

[Zefram]

Hi, I'm the Data-Alias maintainer.  Data-Alias has been updated for Perl
5.22, in Data-Alias-1.19, now on CPAN.  However, I've had reports from two
separate users describing test failures of D-A-1.19 on vendor versions
of Perl 5.22, one Debian and one Fedora.  These new test failures are
recognisable by a bunch of syntax-related error messages from the test
suite, starting with a "Useless use of anonymous hash" warning from
t/03_copy.t, following build success.

I have not been able to reproduce this new failure myself.  It doesn't
happen with my usual configurations of stock Perl 5.22.  It doesn't
happen if I apply as much of the Fedora configuration settings as I can
to stock 5.22.  It even doesn't happen if I use my usual configuration
after applying the patches from the Debian perl 5.22.0-4 package.

It would be really helpful if someone with a failing setup would
try figuring out which part of the perl build makes the difference.
Something I haven't yet tried varying is the C compiler.  I'm using Debian
gcc 4.7.2-5, which doesn't understand the -fstack-protector-strong option
that the failing perls are built with.

-zefram