aircrack-ng: needs toolchain with threads support

Fixes:
http://autobuild.buildroot.org/results/418c9385a9a5a5087a6790001560056d32cd9708

[Peter: drop iw comment]
Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/aircrack-ng/Config.in

@@ -4,11 +4,12 @@ config BR2_PACKAGE_AIRCRACK_NG
 	depends on BR2_USE_MMU # uses fork()
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_IW # runtime
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  A set of tools for auditing wireless networks
 
 	  http://www.aircrack-ng.org/
 
-comment "aircrack-ng needs a toolchain with largefile support"
-	depends on !BR2_LARGEFILE
+comment "aircrack-ng needs a toolchain with largefile and threads support"
+	depends on !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS