trinity: fix build with kernel headers v4.17+

Kernel v4.17 removed the linux/irda.h header. Add a patch to skip the
irda test when the header is missing.

Fixes:
http://autobuild.buildroot.net/results/39d/39d131048d6eb3cd4d802dae462116f7728c41fd/
http://autobuild.buildroot.net/results/af2/af2288711d1a0939a06ea51e65ed32d39e395e2b/
http://autobuild.buildroot.net/results/41f/41fead6d53dba2539ba246f682973e0b5967f3d0/

Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/trinity/0003-configure-fix-build-with-kernel-headers-v4.17.patch

@@ -0,0 +1,73 @@
+From 5431126ac94bf81743852493a041e80e82918741 Mon Sep 17 00:00:00 2001
+From: Baruch Siach <baruch@tkos.co.il>
+Date: Fri, 8 Jun 2018 06:05:26 +0300
+Subject: [PATCH] configure: fix build with kernel headers v4.17+
+
+Kernel v4.17 removed the linux/irda.h header. Skip the irda test when
+this header is missing.
+
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status: https://github.com/kernelslacker/trinity/pull/25
+
+ configure        | 1 +
+ net/proto-irda.c | 6 +++++-
+ net/protocols.c  | 2 ++
+ 3 files changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/configure b/configure
+index c0166af33048..944c8cf77d1b 100755
+--- a/configure
++++ b/configure
+@@ -316,6 +316,7 @@ fi
+ check_header linux/caif/caif_socket.h USE_CAIF
+ check_header linux/fsmap.h USE_FSMAP
+ check_header linux/if_alg.h USE_IF_ALG
++check_header linux/irda.h USE_IRDA
+ check_header linux/rds.h USE_RDS
+ check_header linux/vfio.h USE_VFIO
+ check_header drm/drm.h USE_DRM
+diff --git a/net/proto-irda.c b/net/proto-irda.c
+index 02d51bcd2ee0..264e36dfa040 100644
+--- a/net/proto-irda.c
++++ b/net/proto-irda.c
+@@ -4,13 +4,15 @@
+ #include <sys/un.h>
+ /* old irda.h does not include something which defines sa_family_t */
+ #include <netinet/in.h>
+-#include <linux/irda.h>
+ #include <stdlib.h>
+ #include "net.h"
+ #include "random.h"
+ #include "utils.h"	// RAND_ARRAY
+ #include "compat.h"
+ 
++#ifdef USE_IRDA
++#include <linux/irda.h>
++
+ static void irda_gen_sockaddr(struct sockaddr **addr, socklen_t *addrlen)
+ {
+ 	struct sockaddr_irda *irda;
+@@ -53,3 +55,5 @@ const struct netproto proto_irda = {
+ 	.valid_triplets = irda_triplets,
+ 	.nr_triplets = ARRAY_SIZE(irda_triplets),
+ };
++
++#endif
+diff --git a/net/protocols.c b/net/protocols.c
+index 90a60affedca..87acf85c707f 100644
+--- a/net/protocols.c
++++ b/net/protocols.c
+@@ -26,7 +26,9 @@ const struct protoptr net_protocols[TRINITY_PF_MAX] = {
+ #ifdef USE_RDS
+ 	[PF_RDS] = { .proto = &proto_rds },
+ #endif
++#ifdef USE_IRDA
+ 	[PF_IRDA] = { .proto = &proto_irda },
++#endif
+ 	[PF_LLC] = { .proto = &proto_llc },
+ 	[PF_CAN] = { .proto = &proto_can },
+ 	[PF_TIPC] = { .proto = &proto_tipc },
+-- 
+2.17.1
+