ldns: Avoid perl bug for manpages.

Fix #2663

Signed-off-by: Konstantin Shalygin <k0ste@cn.ru>
[refresh patch]
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

(cherry picked from commit a4a9038f58)

libs/ldns/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ldns
 PKG_VERSION:=1.6.17
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.nlnetlabs.nl/downloads/ldns

libs/ldns/patches/001-perl5-defined-array.patch

@@ -0,0 +1,11 @@
+--- a/doc/doxyparse.pl
++++ b/doc/doxyparse.pl
+@@ -273,7 +273,7 @@ foreach (keys %manpages) {
+ 
+ 	print MAN $MAN_MIDDLE;
+ 
+-	if (defined(@$also)) {
++	if (@$also) {
+ 		print MAN "\n.SH SEE ALSO\n\\fI";
+ 		print MAN join "\\fR, \\fI", @$also;
+ 		print MAN "\\fR.\nAnd ";