package/motion: fix build with gcc 10

Fixes:
 - http://autobuild.buildroot.org/results/99d99dad219776e88aaedcaaf38eb4530d0870ed

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/motion/0001-Fix-build-with-GCC-10.patch

@@ -0,0 +1,53 @@
+From a4a48baf86b18b792fb5e53648b4efd02b3db7b7 Mon Sep 17 00:00:00 2001
+From: Vasiliy Glazov <vascom2@gmail.com>
+Date: Sun, 8 Mar 2020 03:00:21 +0300
+Subject: [PATCH] Fix build with GCC 10.
+
+[Retrieved (and backported) from:
+https://github.com/Motion-Project/motion/commit/a4a48baf86b18b792fb5e53648b4efd02b3db7b7]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ src/netcam.h    | 2 +-
+ src/translate.c | 2 ++
+ src/translate.h | 2 +-
+ 3 files changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/netcam.h b/netcam.h
+index 2951d917..4ee0e1c8 100644
+--- a/netcam.h
++++ b/netcam.h
+@@ -113,7 +113,7 @@ typedef struct netcam_image_buff {
+ } netcam_buff;
+ typedef netcam_buff *netcam_buff_ptr;
+ 
+-struct netcam_caps {                    /* netcam capabilities: */
++extern struct netcam_caps {                    /* netcam capabilities: */
+         unsigned char streaming;        /*  See the NCS_* defines */
+         unsigned char content_length;   /*  0 - unsupported     */
+ } caps;
+diff --git a/translate.c b/translate.c
+index 0c9f1105..a212d9de 100644
+--- a/translate.c
++++ b/translate.c
+@@ -10,6 +10,8 @@
+ #include "motion.h"
+ #include "translate.h"
+ 
++int nls_enabled;
++
+ void translate_locale_chg(const char *langcd){
+ #ifdef HAVE_GETTEXT
+     /* This routine is for development testing only.  It is not used for
+diff --git a/translate.h b/translate.h
+index 0832ffd8..eeba3745 100644
+--- a/translate.h
++++ b/translate.h
+@@ -10,7 +10,7 @@
+ #ifndef _INCLUDE_TRANSLATE_H_
+ #define _INCLUDE_TRANSLATE_H_
+ 
+-int nls_enabled;
++extern int nls_enabled;
+ 
+ #ifdef HAVE_GETTEXT
+ #   include <libintl.h>