package/libnl: add patch to fix build with the musl C library

Add a patch to the package libnl which removes an error when building
libnl against the musl C library.

Signed-off-by: Jörg Krause <jkrause@posteo.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libnl/libnl-0001-netlink-netlink-h-use-poll-h-instead-of-sys-poll-h.patch

@@ -0,0 +1,18 @@
+netlink/netlink.h: As the poll() man page recommends include the <poll.h>
+instead of <sys/poll.h>. This removes an error when building libdl against 
+the musl C library.
+
+Signed-off-by: Jörg Krause <jkrause@posteo.de>
+
+diff -purN libnl-3.2.25.orig/include/netlink/netlink.h libnl-3.2.25/include/netlink/netlink.h
+--- libnl-3.2.25.orig/include/netlink/netlink.h	2014-09-01 11:42:37.254724124 +0200
++++ libnl-3.2.25/include/netlink/netlink.h	2014-09-01 11:42:58.254724255 +0200
+@@ -16,7 +16,7 @@
+ #include <stdint.h>
+ #include <string.h>
+ #include <stdlib.h>
+-#include <sys/poll.h>
++#include <poll.h>
+ #include <sys/socket.h>
+ #include <sys/types.h>
+ #include <sys/time.h>