package/linux-headers: drop 6.13.x option

The 6.13.x series is now EOL upstream, so drop the linux-headers
option and add legacy handling for it.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>

Config.in.legacy

@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2025.05"
 
+config BR2_KERNEL_HEADERS_6_13
+	bool "kernel headers version 6.13.x are no longer supported"
+	select BR2_LEGACY
+	help
+	  Version 6.13.x of the Linux kernel headers are no longer
+	  maintained upstream and are now removed.
+
 config BR2_PACKAGE_MPD_SOUNDCLOUD
 	bool "mpd soundcloud support has been removed"
 	select BR2_LEGACY

linux/linux.hash

@@ -1,6 +1,5 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  21817f1998e2230f81f7e4f605fa6fdcb040e14fa27d99c27ddb16ce749797a9  linux-6.14.6.tar.xz
-sha256  611fbb669cf5539da48137a9c052becd499f3f862afaf21ab84cea3966221242  linux-6.13.12.tar.xz
 sha256  e8a099182562aecff781de72ce769461e706d97af42d740dff20eb450dd5771e  linux-6.12.28.tar.xz
 sha256  ff856748671629c1fefef219099e0b4b81131c2d325e768cb0806e204157014e  linux-6.6.90.tar.xz
 sha256  e319a5bb9049ba9fb8cbc08cba4874716e8985bd10f7971f2573ea802c257911  linux-6.1.138.tar.xz

package/linux-headers/Config.in.host

@@ -48,10 +48,6 @@ config BR2_KERNEL_HEADERS_6_12
 	bool "Linux 6.12.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_12
 
-config BR2_KERNEL_HEADERS_6_13
-	bool "Linux 6.13.x kernel headers"
-	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_13
-
 config BR2_KERNEL_HEADERS_6_14
 	bool "Linux 6.14.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_14
@@ -450,7 +446,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "6.1.138"	if BR2_KERNEL_HEADERS_6_1
 	default "6.6.90"	if BR2_KERNEL_HEADERS_6_6
 	default "6.12.28"	if BR2_KERNEL_HEADERS_6_12
-	default "6.13.12"	if BR2_KERNEL_HEADERS_6_13
 	default "6.14.6"	if BR2_KERNEL_HEADERS_6_14
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL