configs/riotboard: remove defconfig, broken

This defconfig no longer builds:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026769450

It has been broken for at least 2 months:

  https://gitlab.com/buildroot.org/buildroot/-/jobs?name=T%3Driotboard&kind=BUILD

It is using the outdated, not even LTS 4.18.x kernel, which most
likely explains why it no longer builds with modern toolchains.

Unless a fix is provided, this defconfig will be removed.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026769450

Cc: Nikolay Dimitrov <nikolay.dimitrov@retrohub.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

.checkpackageignore

@@ -177,7 +177,6 @@ configs/pc_x86_64_efi_defconfig lib_defconfig.ForceCheckHash
 configs/pine64_defconfig lib_defconfig.ForceCheckHash
 configs/pine64_pinecube_defconfig lib_defconfig.ForceCheckHash
 configs/pine64_star64_defconfig lib_defconfig.ForceCheckHash
-configs/riotboard_defconfig lib_defconfig.ForceCheckHash
 configs/rock64_defconfig lib_defconfig.ForceCheckHash
 configs/rock_pi_n8_defconfig lib_defconfig.ForceCheckHash
 configs/roseapplepi_defconfig lib_defconfig.ForceCheckHash

DEVELOPERS

@@ -2565,10 +2565,6 @@ F:	package/ofono/
 N:	Niklas Cassel <niklas.cassel@wdc.com>
 F:	configs/qemu_riscv64_nommu_virt_defconfig
 
-N:	Nikolay Dimitrov <nikolay.dimitrov@retrohub.org>
-F:	board/embest/riotboard/
-F:	configs/riotboard_defconfig
-
 N:	Nimai Mahajan <nimaim@gmail.com>
 F:	package/libucl/
 

board/embest/riotboard/genimage.cfg

@@ -1,17 +0,0 @@
-image sdcard.img {
-	hdimage {
-	}
-
-	partition u-boot {
-		in-partition-table = "no"
-		image = "u-boot.imx"
-		offset = 1K
-	}
-
-	partition rootfs {
-		partition-type = 0x83
-		image = "rootfs.ext2"
-		offset = 1M
-		size = 60M
-	}
-}

board/embest/riotboard/readme.txt

@@ -1,38 +0,0 @@
-Buildroot for Embest RIoTboard
-==============================
-
-This is a small development board, based on Freescale IMX6 Solo SoC
-(single core ARM Cortex-A9).
-
-More details about the board can be found at:
-
-  http://www.embest-tech.com/riotboard
-
-1. Compiling buildroot
-----------------------
-
-$ make riotboard_defconfig
-$ make
-
-2. Installing buildroot
------------------------
-
-Prepare an SD-card and plug it into your card reader. Always double
-check the block device before writing to it, as writing to the wrong
-block device can cause irrecoverable data loss. Now you can write the
-image to your SD-card:
-
-sudo dd if=output/images/sdcard.img of=/dev/<sdcard-block-device> bs=1M
-
-3. Running buildroot
---------------------
-
-Position the board so you can read the label "RIoTboard" on the right
-side of SW1 DIP switches. Configure the SW1 swiches like this:
-
-1   0  1   0   0  1   0  1
-ON OFF ON OFF OFF ON OFF ON
-
-Now plug your prepared SD-card in slot J6. Connect a serial console
-(115200, 8, N, 1) to header J18. Connect a 5V/1A power supply to the
-board and enjoy.

board/embest/riotboard/rootfs_overlay/boot/extlinux/extlinux.conf

@@ -1,6 +0,0 @@
-default buildroot
-
-label buildroot
-kernel /boot/zImage
-devicetree /boot/imx6dl-riotboard.dtb
-append console=ttymxc1,115200 root=/dev/mmcblk1p1 rw

configs/riotboard_defconfig

@@ -1,28 +0,0 @@
-BR2_arm=y
-BR2_cortex_a9=y
-BR2_ARM_ENABLE_NEON=y
-BR2_ARM_ENABLE_VFP=y
-BR2_ARM_FPU_VFPV3=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_18=y
-BR2_TARGET_GENERIC_GETTY_PORT="ttymxc1"
-BR2_ROOTFS_OVERLAY="board/embest/riotboard/rootfs_overlay"
-BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
-BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/embest/riotboard/genimage.cfg"
-BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.18.10"
-BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
-BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6dl-riotboard"
-BR2_LINUX_KERNEL_INSTALL_TARGET=y
-BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
-BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_4=y
-BR2_TARGET_UBOOT=y
-BR2_TARGET_UBOOT_BOARDNAME="riotboard"
-BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2018.07"
-BR2_TARGET_UBOOT_FORMAT_IMX=y
-BR2_PACKAGE_HOST_DOSFSTOOLS=y
-BR2_PACKAGE_HOST_GENIMAGE=y
-BR2_PACKAGE_HOST_MTOOLS=y