Bug#985884: porting/libperl.t tests fail when building with lto

[Matthias Klose]

Package: src:perl
Version: 5.32.1-3

porting/libperl.t tests fail when building with lto.
see https://wiki.debian.org/ToolChain/LTO

I just disabled the test in Ubuntu,

http://launchpadlibrarian.net/529417162/perl_5.32.1-3ubuntu1_5.32.1-3ubuntu2.diff.gz

it's not run on other architectures, and it's only testing the (almost unused)
static library, afaics.  I didn't look into "fixing" the test.

Test results for autopkg tests triggered by perl look good so far.