owfs: fix compilation with GCC10

Upstream backport.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

utils/owfs/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=owfs
 PKG_VERSION:=3.2p3
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/owfs/owfs/releases/download/v$(PKG_VERSION)

utils/owfs/patches/010-gcc10.patch

@@ -0,0 +1,38 @@
+From 43a4bc6b750c37f585d03b14941f3633ed5348d8 Mon Sep 17 00:00:00 2001
+From: "Azamat H. Hackimov" <azamat.hackimov@gmail.com>
+Date: Tue, 9 Jun 2020 11:30:38 +0300
+Subject: [PATCH] Fix compilation with GCC10
+
+Fixed compilation with -fno-common, which enabled in GCC 10 by default.
+See https://bugs.gentoo.org/707438.
+---
+ module/owserver/src/c/owserver.c       | 2 ++
+ module/owserver/src/include/owserver.h | 2 +-
+ 2 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/module/owserver/src/c/owserver.c b/module/owserver/src/c/owserver.c
+index db29988e..2ed29161 100644
+--- a/module/owserver/src/c/owserver.c
++++ b/module/owserver/src/c/owserver.c
+@@ -36,6 +36,8 @@
+ 
+ #include "owserver.h"
+ 
++pthread_mutex_t persistence_mutex ;
++
+ /* --- Prototypes ------------ */
+ static void SetupAntiloop(int argc, char **argv);
+ 
+diff --git a/module/owserver/src/include/owserver.h b/module/owserver/src/include/owserver.h
+index 8be582f0..a257ed02 100644
+--- a/module/owserver/src/include/owserver.h
++++ b/module/owserver/src/include/owserver.h
+@@ -18,7 +18,7 @@
+ #include "ow.h"
+ #include "ow_connection.h"
+ 
+-pthread_mutex_t persistence_mutex ;
++extern pthread_mutex_t persistence_mutex ;
+ #define PERSISTENCELOCK    _MUTEX_LOCK(   persistence_mutex ) ;
+ #define PERSISTENCEUNLOCK  _MUTEX_UNLOCK( persistence_mutex ) ;
+