package/linux-headers: drop 6.3.x option

The 6.3.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: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Config.in.legacy

@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2023.08"
 
+config BR2_KERNEL_HEADERS_6_3
+	bool "kernel headers version 6.3.x are no longer supported"
+	select BR2_LEGACY
+	help
+	  Version 6.3.x of the Linux kernel headers are no longer
+	  maintained upstream and are now removed.
+
 config BR2_PACKAGE_TOVID
 	bool "tovid removed"
 	select BR2_LEGACY

linux/linux.hash

@@ -1,6 +1,5 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  9cbc4a2be714a4d154e1312c9f33ded91174907c8b15ee936ad27002ac75ff2a  linux-6.4.4.tar.xz
-sha256  ea460560e2898022c5f3c4649908694dcd75a094ffde726e8c6ca5e0a09491fb  linux-6.3.13.tar.xz
 sha256  4cddee22fdf657138a06af653492f67cd3a4762c04a34725534bd200d99085b8  linux-6.1.39.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
 sha256  6499089eae6b271063cb3e873ab7f4ba0543cfb21dcc9c54d9bcf5357db683f6  linux-5.15.120.tar.xz

package/linux-headers/Config.in.host

@@ -49,10 +49,6 @@ config BR2_KERNEL_HEADERS_6_1
 	bool "Linux 6.1.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_1
 
-config BR2_KERNEL_HEADERS_6_3
-	bool "Linux 6.3.x kernel headers"
-	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_3
-
 config BR2_KERNEL_HEADERS_6_4
 	bool "Linux 6.4.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_4
@@ -410,7 +406,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "5.10.186"	if BR2_KERNEL_HEADERS_5_10
 	default "5.15.120"	if BR2_KERNEL_HEADERS_5_15
 	default "6.1.39"	if BR2_KERNEL_HEADERS_6_1
-	default "6.3.13"	if BR2_KERNEL_HEADERS_6_3
 	default "6.4.4"		if BR2_KERNEL_HEADERS_6_4
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL