linux-headers: remove deprecated version 3.16.x

Remove for the upcoming 2016.02 release, it's been deprecated for a year
now.

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

Config.in.legacy

@@ -145,6 +145,16 @@ endif
 ###############################################################################
 comment "Legacy options removed in 2016.02"
 
+config BR2_KERNEL_HEADERS_3_16
+	bool "kernel headers version 3.16.x are no longer supported"
+	select BR2_KERNEL_HEADERS_3_18
+	select BR2_LEGACY
+	help
+	Version 3.16.x of the Linux kernel headers have been deprecated
+	for more than four buildroot releases and are now removed.
+	As an alternative, version 3.18.x of the headers have been
+	automatically selected in your configuration.
+
 config BR2_PACKAGE_PYTHON_PYXML
 	bool "python-pyxml package has been removed"
 	select BR2_LEGACY

package/linux-headers/Config.in.host

@@ -36,12 +36,6 @@ choice
 		depends on !BR2_nios2
 		select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 
-	config BR2_KERNEL_HEADERS_3_16
-		bool "Linux 3.16.x kernel headers"
-		depends on BR2_DEPRECATED_SINCE_2015_02
-		depends on !BR2_nios2
-		select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
-
 	config BR2_KERNEL_HEADERS_3_17
 		bool "Linux 3.17.x kernel headers"
 		depends on BR2_DEPRECATED_SINCE_2015_05
@@ -213,7 +207,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "3.10.94"	if BR2_KERNEL_HEADERS_3_10
 	default "3.12.52"	if BR2_KERNEL_HEADERS_3_12
 	default "3.14.58"	if BR2_KERNEL_HEADERS_3_14
-	default "3.16.7"	if BR2_KERNEL_HEADERS_3_16
 	default "3.17.8"	if BR2_KERNEL_HEADERS_3_17
 	default "3.18.25"	if BR2_KERNEL_HEADERS_3_18
 	default "3.19.8"	if BR2_KERNEL_HEADERS_3_19