package/mosquitto: fix static linking with c-ares and openssl

Add WITH_TLS_STATIC_LIB_DEPS to fix static linking with openssl and
c-ares as using STATIC_LIB_DEPS override internal settings such as
-lcares

Fixes:
 - http://autobuild.buildroot.org/results/0a25229241aa20b98747d9abe8b1363033126e9e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mosquitto/0001-config.mk-add-WITH_TLS_STATIC_LIB_DEPS.patch

@@ -0,0 +1,41 @@
+From 9a1ea149d3451d4edf32c5f0f0d1b4fecfbff4a2 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Tue, 6 Aug 2019 22:11:57 +0200
+Subject: [PATCH] config.mk: add WITH_TLS_STATIC_LIB_DEPS
+
+Add WITH_TLS_STATIC_LIB_DEPS to allow the user to give openssl static
+libraries dependencies such as -lz or -latomic
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/eclipse/mosquitto/pull/1371]
+---
+ config.mk | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/config.mk b/config.mk
+index 6c23bef..c9e2daf 100644
+--- a/config.mk
++++ b/config.mk
+@@ -23,6 +23,10 @@
+ # password authentication at all.
+ WITH_TLS:=yes
+ 
++# Use this variable to give openssl static libraries dependencies (such as -lz
++# or -latomic) that can be retrieved for example by pkg-config
++WITH_TLS_STATIC_LIB_DEPS:=
++
+ # Comment out to disable TLS/PSK support in the broker and client. Requires
+ # WITH_TLS=yes.
+ # This must be disabled if using openssl < 1.0.
+@@ -202,7 +206,7 @@ ifeq ($(WITH_TLS),yes)
+ 	LIB_CPPFLAGS:=$(LIB_CPPFLAGS) -DWITH_TLS
+ 	PASSWD_LDADD:=$(PASSWD_LDADD) -lcrypto
+ 	CLIENT_CPPFLAGS:=$(CLIENT_CPPFLAGS) -DWITH_TLS
+-	STATIC_LIB_DEPS:=$(STATIC_LIB_DEPS) -lssl -lcrypto
++	STATIC_LIB_DEPS:=$(STATIC_LIB_DEPS) -lssl -lcrypto $(WITH_TLS_STATIC_LIB_DEPS)
+ 
+ 	ifeq ($(WITH_TLS_PSK),yes)
+ 		BROKER_CPPFLAGS:=$(BROKER_CPPFLAGS) -DWITH_TLS_PSK
+-- 
+2.20.1
+

package/mosquitto/mosquitto.mk

@@ -51,7 +51,7 @@ ifeq ($(BR2_PACKAGE_LIBOPENSSL),y)
 MOSQUITTO_DEPENDENCIES += host-pkgconf libopenssl
 MOSQUITTO_MAKE_OPTS += \
 	WITH_TLS=yes \
-	STATIC_LIB_DEPS="`$(PKG_CONFIG_HOST_BINARY) --libs openssl`"
+	WITH_TLS_STATIC_LIB_DEPS="`$(PKG_CONFIG_HOST_BINARY) --libs openssl`"
 else
 MOSQUITTO_MAKE_OPTS += WITH_TLS=no
 endif