package/linux-headers: drop 6.5.x option

The 6.5.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>
[Peter: drop option from linux-headers/Config.host.in]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Config.in.legacy

@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2023.11"
 
+config BR2_KERNEL_HEADERS_6_5
+	bool "kernel headers version 6.5.x are no longer supported"
+	select BR2_LEGACY
+	help
+	  Version 6.5.x of the Linux kernel headers are no longer
+	  maintained upstream and are now removed.
+
 config BR2_PACKAGE_PYTHON_PYXB
 	bool "python-pyxb removed"
 	select BR2_LEGACY

linux/linux.hash

@@ -1,6 +1,5 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  28edfc3d4f90cd738f2a20f5a2d68510268176d6111f6278d8f495edfd9495a7  linux-6.6.3.tar.xz
-sha256  78fbd43822f4c56bc16e89e8874767f592532e1a0ffcd1af4dd279559b5fcbb5  linux-6.5.13.tar.xz
 sha256  629daa38f3ea67f29610bfbd53f9f38f46834d3654451e9474100490c66dc7e7  linux-6.1.64.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
 sha256  be2bee8b346f3ccb35879f16c80a323edda571e36190403805c14a9ea24e4a47  linux-5.15.140.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_5
-	bool "Linux 6.5.x kernel headers"
-	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_5
-
 config BR2_KERNEL_HEADERS_6_6
 	bool "Linux 6.6.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_6
@@ -418,7 +414,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "5.10.202"	if BR2_KERNEL_HEADERS_5_10
 	default "5.15.140"	if BR2_KERNEL_HEADERS_5_15
 	default "6.1.64"	if BR2_KERNEL_HEADERS_6_1
-	default "6.5.13"	if BR2_KERNEL_HEADERS_6_5
 	default "6.6.3"		if BR2_KERNEL_HEADERS_6_6
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL