wireguard: don't build on Linux 5.10

There are efforts underway to bring wireguard in-tree for Linux 5.4 and
to have a common build infrastructure for both 5.4 and 5.10 for
kmod-wireguard[0]. Until then, restrict kmod-wireguard to build only on
Linux 5.4, because the wireguard-compat package will not build on Linux
5.10.

[0]: https://github.com/openwrt/openwrt/pull/3885



Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

package/network/services/wireguard/Makefile

@@ -50,7 +50,7 @@ endef
 define Package/wireguard
   $(call Package/wireguard/Default)
   TITLE:=WireGuard meta-package
-  DEPENDS:=+wireguard-tools +kmod-wireguard
+  DEPENDS:=+wireguard-tools +kmod-wireguard @LINUX_5_4
 endef
 
 include $(INCLUDE_DIR)/kernel-defaults.mk
@@ -73,7 +73,7 @@ define KernelPackage/wireguard
   CATEGORY:=Kernel modules
   SUBMENU:=Network Support
   TITLE:=WireGuard kernel module
-  DEPENDS:=+IPV6:kmod-udptunnel6 +kmod-udptunnel4
+  DEPENDS:=+IPV6:kmod-udptunnel6 +kmod-udptunnel4 @LINUX_5_4
   FILES:= $(PKG_BUILD_DIR)/src/wireguard.$(LINUX_KMOD_SUFFIX)
   AUTOLOAD:=$(call AutoProbe,wireguard)
 endef