libndp: new package

[Thomas: add patch to add stdarg.h include needed on uClibc, add
missing upstream URL in Config.in, fix license to be LGPLv2.1+ instead
of LGPLv2.1]

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Config.in

@@ -714,6 +714,7 @@ source "package/libmbus/Config.in"
 source "package/libmicrohttpd/Config.in"
 source "package/libmnl/Config.in"
 source "package/libmodbus/Config.in"
+source "package/libndp/Config.in"
 source "package/libnetfilter_acct/Config.in"
 source "package/libnetfilter_conntrack/Config.in"
 source "package/libnetfilter_cthelper/Config.in"

package/libndp/Config.in

@@ -0,0 +1,12 @@
+config BR2_PACKAGE_LIBNDP
+	bool "libndp"
+	depends on BR2_INET_IPV6
+	help
+	  This package contains a library which provides a wrapper
+	  for IPv6 Neighbor Discovery Protocol. It also provides a tool
+	  named ndptool for sending and receiving NDP messages.
+
+	  https://github.com/jpirko/libndp
+
+comment "libndp needs a toolchain w/ IPv6"
+	depends on !BR2_INET_IPV6

package/libndp/libndp-01-missing-stdarg-include.patch

@@ -0,0 +1,16 @@
+Add missing <stdarg.h> include for va_list
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+Index: b/include/ndp.h
+===================================================================
+--- a/include/ndp.h
++++ b/include/ndp.h
+@@ -20,6 +20,7 @@
+ #ifndef _NDP_H_
+ #define _NDP_H_
+ 
++#include <stdarg.h>
+ #include <stdbool.h>
+ #include <netinet/in.h>
+ 

package/libndp/libndp.mk

@@ -0,0 +1,15 @@
+################################################################################
+#
+# libndp
+#
+################################################################################
+
+LIBNDP_VERSION = v1.2
+LIBNDP_SITE = $(call github,jpirko,libndp,$(LIBNDP_VERSION))
+LIBNDP_LICENSE = LGPLv2.1+
+LIBNDP_LICENSE_FILES = COPYING
+LIBNDP_AUTORECONF = YES
+LIBNDP_INSTALL_STAGING = YES
+LIBNDP_CONF_OPT = --disable-debug
+
+$(eval $(autotools-package))