configs/openblocks_a6_defconfig: add hashes for Linux / headers

And enable BR2_DOWNLOAD_FORCE_CHECK_HASHES.

Generated by utils/add-custom-hashes, with the (redundant)
linux-headers.hash replaced by a symlink.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
[yann.morin.1998@free.fr: update .checkpackageignore]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

.checkpackageignore

@@ -265,7 +265,6 @@ configs/olimex_a64_olinuxino_defconfig lib_defconfig.ForceCheckHash
 configs/olimex_stmp157_olinuxino_lime_defconfig lib_defconfig.ForceCheckHash
 configs/olpc_xo175_defconfig lib_defconfig.ForceCheckHash
 configs/olpc_xo1_defconfig lib_defconfig.ForceCheckHash
-configs/openblocks_a6_defconfig lib_defconfig.ForceCheckHash
 configs/orangepi_lite2_defconfig lib_defconfig.ForceCheckHash
 configs/orangepi_lite_defconfig lib_defconfig.ForceCheckHash
 configs/orangepi_one_defconfig lib_defconfig.ForceCheckHash

board/openblocks/a6/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/openblocks/a6/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  0820fdb7971c6974338081c11fbf2dc869870501e7bdcac4d0ed58ba1f57b61c  linux-4.14.336.tar.xz

configs/openblocks_a6_defconfig

@@ -3,6 +3,8 @@ BR2_arm=y
 BR2_arm926t=y
 
 # system
+BR2_GLOBAL_PATCH_DIR="board/openblocks/a6/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 BR2_TARGET_GENERIC_HOSTNAME="openblocks-a6"
 BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
 BR2_SYSTEM_DHCP="eth0"