linux-headers: bump 4.{9, 12, 13}.x series

[Peter: drop 4.12.x/4.13.x bump]
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 2aae8765fd8ce95a8a1f902f96293b610c5b8405)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -224,5 +224,5 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "4.1.43"	if BR2_KERNEL_HEADERS_4_1
 	default "4.4.87"	if BR2_KERNEL_HEADERS_4_4
 	default "4.8.17"	if BR2_KERNEL_HEADERS_4_8
-	default "4.9.48"	if BR2_KERNEL_HEADERS_4_9
+	default "4.9.49"	if BR2_KERNEL_HEADERS_4_9
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION