package/mosquito: needs sync_4

Fixes:
    http://autobuild.buildroot.org/results/2bc/2bc84ba2d1167018e2d48e5183ead22b6425dcf5/
    http://autobuild.buildroot.org/results/445/445f377ae70397b5f675f541977900e8986b79a4/
    http://autobuild.buildroot.org/results/57e/57e6984427f8c5d906a93884cc461b8f93cf5ce0/
    ...

[Peter: also add dependency to mosquitto comment]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/collectd/Config.in

@@ -526,6 +526,7 @@ config BR2_PACKAGE_COLLECTD_GRAPHITE
 
 config BR2_PACKAGE_COLLECTD_MQTT
 	bool "mqtt"
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # mosquitto
 	select BR2_PACKAGE_MOSQUITTO
 	help
 	  Sends metrics to and/or receives metrics from an MQTT broker.

package/domoticz/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_DOMOTICZ
 	bool "domoticz"
 	depends on BR2_USE_MMU # mosquitto
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # mosquitto
 	depends on !BR2_STATIC_LIBS # mosquitto
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_INSTALL_LIBSTDCPP
@@ -28,6 +29,7 @@ config BR2_PACKAGE_DOMOTICZ
 
 comment "domoticz needs lua >= 5.2 and a toolchain w/ C++, threads, wchar, dynamic library"
 	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_SH
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
 		!BR2_USE_WCHAR || BR2_STATIC_LIBS || \

package/mosquitto/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_MOSQUITTO
 	bool "mosquitto"
 	depends on BR2_USE_MMU # fork()
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_STATIC_LIBS # builds .so
 	help
 	  Mosquitto is an open source message broker that implements
@@ -15,4 +16,5 @@ config BR2_PACKAGE_MOSQUITTO
 
 comment "mosquitto needs a toolchain w/ dynamic library"
 	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on BR2_STATIC_LIBS