package/ffmpeg: Fix build for mips

Fixes:
http://autobuild.buildroot.net/results/079/079df777211933b92ac5a67fc175839c8188850f/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/ffmpeg/0003-libavutil-Fix-mips-build.patch

@@ -0,0 +1,72 @@
+From 6e8daf0d502a2a822f1f08f42368d7d676dc1a9e Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd.kuhls@t-online.de>
+Date: Sun, 6 Jun 2021 08:54:53 +0200
+Subject: [PATCH] libavutil: Fix mips build
+
+Check for sys/auxv.h because not all toolchains contain this header.
+
+Fixes https://trac.ffmpeg.org/ticket/9138
+
+Patch sent upstream:
+http://ffmpeg.org/pipermail/ffmpeg-devel/2021-June/281037.html
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ configure            | 2 ++
+ libavutil/mips/cpu.c | 6 +++---
+ 2 files changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/configure b/configure
+index 82367fd30d..b0154cb8b2 100755
+--- a/configure
++++ b/configure
+@@ -2161,6 +2161,7 @@ HEADERS_LIST="
+     opencv2_core_core_c_h
+     OpenGL_gl3_h
+     poll_h
++    sys_auxv_h
+     sys_param_h
+     sys_resource_h
+     sys_select_h
+@@ -6210,6 +6211,7 @@ check_func_headers VideoToolbox/VTCompressionSession.h VTCompressionSessionPrepa
+ check_headers windows.h
+ check_headers X11/extensions/XvMClib.h
+ check_headers asm/types.h
++check_headers sys/auxv.h
+ 
+ # it seems there are versions of clang in some distros that try to use the
+ # gcc headers, which explodes for stdatomic
+diff --git a/libavutil/mips/cpu.c b/libavutil/mips/cpu.c
+index 59619d54de..4738104cdd 100644
+--- a/libavutil/mips/cpu.c
++++ b/libavutil/mips/cpu.c
+@@ -19,7 +19,7 @@
+ #include "libavutil/cpu.h"
+ #include "libavutil/cpu_internal.h"
+ #include "config.h"
+-#if defined __linux__ || defined __ANDROID__
++#if (defined __linux__ || defined __ANDROID__) && defined(HAVE_SYS_AUXV_H)
+ #include <stdint.h>
+ #include <stdio.h>
+ #include <string.h>
+@@ -28,7 +28,7 @@
+ #include "libavutil/avstring.h"
+ #endif
+ 
+-#if defined __linux__ || defined __ANDROID__
++#if (defined __linux__ || defined __ANDROID__) && defined(HAVE_SYS_AUXV_H)
+ 
+ #define HWCAP_LOONGSON_CPUCFG (1 << 14)
+ 
+@@ -105,7 +105,7 @@ static int cpu_flags_cpuinfo(void)
+ 
+ int ff_get_cpu_flags_mips(void)
+ {
+-#if defined __linux__ || defined __ANDROID__
++#if (defined __linux__ || defined __ANDROID__) && defined(HAVE_SYS_AUXV_H)
+     if (cpucfg_available())
+         return cpu_flags_cpucfg();
+     else
+-- 
+2.29.2
+