[openwrt/openwrt] iproute2: add missing limits.h includes

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/e07105303f538a4713db61d5f99017e81e87ab2c

commit e07105303f538a4713db61d5f99017e81e87ab2c
Author: Tony Ambardar <itugrok at yahoo.com>
AuthorDate: Fri Mar 12 20:58:28 2021 -0800

    iproute2: add missing limits.h includes
    
    This patch has been submitted upstream to fix an error reported by a few
    users. One instance seen using gcc 10.2.0, binutils 2.35.1 and musl 1.1.24:
    
    bpf_glue.c: In function 'get_libbpf_version':
    bpf_glue.c:46:11: error: 'PATH_MAX' undeclared (first use in this function);
    did you mean 'AF_MAX'?
       46 |  char buf[PATH_MAX], *s;
          |           ^~~~~~~~
          |           AF_MAX
    
    Reported-by: Rui Salvaterra <rsalvaterra at gmail.com>
    Signed-off-by: Tony Ambardar <itugrok at yahoo.com>
    (cherry picked from commit 10ffefe60299637bc592ec4ef0dde93e0e2e8344)
---
 .../iproute2/patches/185-libbpf-add-limits-h.patch | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/package/network/utils/iproute2/patches/185-libbpf-add-limits-h.patch b/package/network/utils/iproute2/patches/185-libbpf-add-limits-h.patch
new file mode 100644
index 0000000000..07dbbc65b9
--- /dev/null
+++ b/package/network/utils/iproute2/patches/185-libbpf-add-limits-h.patch
@@ -0,0 +1,45 @@
+From c77310119f9a5f99221dd967c5eb0c7a26094b41 Mon Sep 17 00:00:00 2001
+From: Tony Ambardar <Tony.Ambardar at gmail.com>
+Date: Wed, 3 Mar 2021 10:29:24 -0800
+Subject: [PATCH] lib/bpf: add missing limits.h includes
+
+Several functions in bpf_glue.c and bpf_libbpf.c rely on PATH_MAX, which is
+normally included from <limits.h> in other iproute2 source files.
+
+It fixes errors seen using gcc 10.2.0, binutils 2.35.1 and musl 1.1.24:
+
+bpf_glue.c: In function 'get_libbpf_version':
+bpf_glue.c:46:11: error: 'PATH_MAX' undeclared (first use in this function);
+did you mean 'AF_MAX'?
+   46 |  char buf[PATH_MAX], *s;
+      |           ^~~~~~~~
+      |           AF_MAX
+
+Reported-by: Rui Salvaterra <rsalvaterra at gmail.com>
+Signed-off-by: Tony Ambardar <Tony.Ambardar at gmail.com>
+---
+ lib/bpf_glue.c   | 2 ++
+ lib/bpf_libbpf.c | 1 +
+ 2 files changed, 3 insertions(+)
+
+--- a/lib/bpf_glue.c
++++ b/lib/bpf_glue.c
+@@ -4,6 +4,8 @@
+  * Authors:	Hangbin Liu <haliu at redhat.com>
+  *
+  */
++#include <limits.h>
++
+ #include "bpf_util.h"
+ #ifdef HAVE_LIBBPF
+ #include <bpf/bpf.h>
+--- a/lib/bpf_libbpf.c
++++ b/lib/bpf_libbpf.c
+@@ -13,6 +13,7 @@
+ #include <stdint.h>
+ #include <errno.h>
+ #include <fcntl.h>
++#include <limits.h>
+ 
+ #include <libelf.h>
+ #include <gelf.h>