configs/galileo: update kernel version to fix build with gcc 6.x

The kernel used so far for the galileo boards would not successfully
build with GCC versions greater than 5.

See: https://github.com/mdr78/Linux-x1000/pull/2

Signed-off-by: Nicholas Sielicki <sielicki@yandex.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 62ec0af5fb910f08095548b33062cef20d4ca07b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/galileo_defconfig

@@ -10,7 +10,7 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="board/intel/galileo/post-image.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/mdr78/Linux-x1000.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="0feded4f96ddca9816c6c1b8a4780cb4065747b9"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="8b3c9d8ce1656a26b1097d9091d53bfb39fef640"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/intel/galileo/linux-3.14.config"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y