linux-headers: mark EOL versions deprecated

Follow the upstream EOL cycle and mark 4.2 as deprecated for 2016.02.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -69,6 +69,7 @@ choice
 
 	config BR2_KERNEL_HEADERS_4_2
 		bool "Linux 4.2.x kernel headers"
+		depends on BR2_DEPRECATED_SINCE_2016_02
 		select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 
 	config BR2_KERNEL_HEADERS_4_3