netatalk: requires threads

Fixes:
http://autobuild.buildroot.net/results/e19/e191a9e0768b632b84c3a8a8201538bd5fbe3708/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/netatalk/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_NETATALK
 	bool "netatalk"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_BERKELEYDB
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_LIBGCRYPT
@@ -9,3 +10,6 @@ config BR2_PACKAGE_NETATALK
 	  high-performance and reliable file server for Macintosh computers.
 
 	  http://netatalk.sourceforge.net/
+
+comment "netatalk requires a toolchain with thread support"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS