buildroot: workaround broken syntax highlighting

GNU Make's subst is always breaking syntax highlighting with at least
vim add the right comments to workaround it.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 37046

include/kernel-defaults.mk

@@ -116,6 +116,7 @@ OBJCOPY_STRIP = -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.g
 define Kernel/CompileImage/Default
 	$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS),,rm -f $(TARGET_DIR)/init)
 	+$(MAKE) $(KERNEL_MAKEOPTS) $(subst ",,$(KERNELNAME))
+	#")
 	$(KERNEL_CROSS)objcopy -O binary $(OBJCOPY_STRIP) -S $(LINUX_DIR)/vmlinux $(LINUX_KERNEL)
 	$(KERNEL_CROSS)objcopy $(OBJCOPY_STRIP) -S $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux.elf
 endef