linux-headers: bump 3.12.x stable version

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

@@ -158,6 +158,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "3.9.11"	if BR2_KERNEL_HEADERS_3_9
 	default "3.10.34"	if BR2_KERNEL_HEADERS_3_10
 	default "3.11.10"	if BR2_KERNEL_HEADERS_3_11
-	default "3.12.14"	if BR2_KERNEL_HEADERS_3_12
+	default "3.12.15"	if BR2_KERNEL_HEADERS_3_12
 	default "3.13.7"	if BR2_KERNEL_HEADERS_3_13
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION