linux: add support for 4.x versions

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/linux.mk

@@ -25,12 +25,14 @@ LINUX_SITE_METHOD = hg
 else
 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
-# to use the $(word) function. We support versions such as 3.1,
+# to use the $(word) function. We support versions such as 4.0, 3.1,
 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
-else
+else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
+else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
+LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
 endif
 # release candidates are in testing/ subdir
 ifneq ($(findstring -rc,$(LINUX_VERSION)),)