libldns: Fix build error with perl 5.10

Add more upstream commits to fix build errors with perl 5.10
introduced by the previous patch to fix build errors with perl 5.22.

Fixes
http://autobuild.buildroot.net/results/325/32519c6d4084f334b7fed9edfb8a8c68a1f840a8/


and many others.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Thomas: reformat patches as proper Git formatted patches.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>