Bug#752468: xchat-gnome: perl autoconf probe needs changes for Perl 5.20

[Niko Tyni]

Package: xchat-gnome
Version: 1:0.30.0~git20131003.d20b8d-2 
Severity: important
Tags: patch
User: debian-perl at lists.debian.org
Usertags: perl-5.20-transition

This package silently drops its libperl linkage when built
with perl_5.20.0-1 from experimental:

  checking whether Perl support is requested... autodetect
  checking for perl... /usr/bin/perl
  configure: WARNING: Perl headers not found, disabling perl support

This is because the probe in configure.ac now needs to either
link with libperl or #define PERL_NO_INLINE_FUNCTIONS.
See #752354.

I'm attaching Damyan Ivanov's patch from #752354, which
uses the first approach.
-- 
Niko Tyni   ntyni at debian.org
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