linux-headers: bump 3.12.x and 4.{4, 8}.x series

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

package/linux-headers/Config.in.host

@@ -226,15 +226,15 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "3.2.83"	if BR2_KERNEL_HEADERS_3_2
 	default "3.4.113"	if BR2_KERNEL_HEADERS_3_4
 	default "3.10.104"	if BR2_KERNEL_HEADERS_3_10
-	default "3.12.66"	if BR2_KERNEL_HEADERS_3_12
+	default "3.12.67"	if BR2_KERNEL_HEADERS_3_12
 	default "3.14.79"	if BR2_KERNEL_HEADERS_3_14
 	default "3.18.44"	if BR2_KERNEL_HEADERS_3_18
 	default "3.19.8"	if BR2_KERNEL_HEADERS_3_19
 	default "4.0.9"		if BR2_KERNEL_HEADERS_4_0
 	default "4.1.35"	if BR2_KERNEL_HEADERS_4_1
-	default "4.4.29"	if BR2_KERNEL_HEADERS_4_4
+	default "4.4.31"	if BR2_KERNEL_HEADERS_4_4
 	default "4.5.7"		if BR2_KERNEL_HEADERS_4_5
 	default "4.6.7"		if BR2_KERNEL_HEADERS_4_6
 	default "4.7.10"	if BR2_KERNEL_HEADERS_4_7
-	default "4.8.6"		if BR2_KERNEL_HEADERS_4_8
+	default "4.8.7"		if BR2_KERNEL_HEADERS_4_8
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION