sconeserver: requires thread support

Fixes autobuild failures such as the following.

  http://autobuild.buildroot.net/results/a290aa34bd44c0e08f7aa44a7c606420668eef6d/

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sconeserver/Config.in

@@ -1,6 +1,7 @@
 menuconfig BR2_PACKAGE_SCONESERVER
 	bool "sconeserver"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_PCRE
 	help
 	  Sconeserver is a modular, object-orientated and extremely versatile
@@ -90,5 +91,5 @@ comment "ui module requires X.org"
 
 endif # BR2_PACKAGE_SCONESERVER
 
-comment "sconeserver requires a toolchain with C++ support enabled"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "sconeserver requires a toolchain with C++ and thread support enabled"
+	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_TOOLCHAIN_HAS_THREADS)