linux-headers: bump 3.{4,10,12}.x stable versions

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -83,14 +83,14 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "3.1.10"	if BR2_KERNEL_HEADERS_3_1
 	default "3.2.53"	if BR2_KERNEL_HEADERS_3_2
 	default "3.3.8"		if BR2_KERNEL_HEADERS_3_3
-	default "3.4.72"	if BR2_KERNEL_HEADERS_3_4
+	default "3.4.73"	if BR2_KERNEL_HEADERS_3_4
 	default "3.5.7"		if BR2_KERNEL_HEADERS_3_5
 	default "3.6.11"	if BR2_KERNEL_HEADERS_3_6
 	default "3.7.10"	if BR2_KERNEL_HEADERS_3_7
 	default "3.8.13"	if BR2_KERNEL_HEADERS_3_8
 	default "3.9.11"	if BR2_KERNEL_HEADERS_3_9
-	default "3.10.22"	if BR2_KERNEL_HEADERS_3_10
+	default "3.10.23"	if BR2_KERNEL_HEADERS_3_10
 	default "3.11.10"	if BR2_KERNEL_HEADERS_3_11
-	default "3.12.3"	if BR2_KERNEL_HEADERS_3_12
+	default "3.12.4"	if BR2_KERNEL_HEADERS_3_12
 	default "2.6"		if BR2_KERNEL_HEADERS_SNAP
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION