openvswitch: rework skipping intree kmod build for unsupported kernels

This is a workaround to prevent the whole build from failing because of
the intree kmods are not supported yet by upstream project.

Root cause is that kernel version should not play a part when making
DEPENDS as the generated kconfig was for all targets that may have
different kernel versions.

One less than ideal effect of this change is that for an unsupported
kernel version, people can still select the intree kmod but it won't be
built.  This may contradict expectation if the warning was not noticed
by them

Resolves openwrt/packages#9274

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

net/openvswitch/Makefile

@@ -49,12 +49,13 @@ ovs_kmod_is_intree=$(filter %-intree,$(1))
 ovs_kmod_upstream_name=kmod-$(call ovs_kmod_package_name,$(patsubst %-intree,%,$(1)))
 ovs_kmod_package_provides=$(call ovs_kmod_upstream_name,$(1))
 define OvsKmodPackageTemplate
+ifeq ($(if $(call ovs_kmod_is_intree,$(1)),$(ovs_kmod_intree_not_supported)),)
   define KernelPackage/$(call ovs_kmod_package_name,$(1))
      SECTION:=kernel
      CATEGORY:=Kernel modules
      SUBMENU:=Network Support
      TITLE:=$(ovs_kmod_$(1)_title)
-     DEPENDS:=$(ovs_kmod_$(1)_depends) $(if $(call ovs_kmod_is_intree,$(1)),@DEVEL $(if $(ovs_kmod_intree_not_supported),@BROKEN))
+     DEPENDS:=$(ovs_kmod_$(1)_depends) $(if $(call ovs_kmod_is_intree,$(1)),@DEVEL)
      PROVIDES:=$(call ovs_kmod_package_provides,$(1))
      KCONFIG:=$(ovs_kmod_$(1)_kconfig)
      FILES:=$(ovs_kmod_$(1)_files)
@@ -62,6 +63,7 @@ define OvsKmodPackageTemplate
   endef
 
   ovs_kmod_packages+=$(call ovs_kmod_package_name,$(1))
+endif
 endef
 
 ovs_kmod_openvswitch_title:=Open vSwitch kernel datapath (upstream)
@@ -311,7 +313,11 @@ ovs_intree_kmod_configs:=CONFIG_PACKAGE_kmod-openvswitch-intree
 ovs_intree_kmod_enabled:=$(strip $(foreach c,$(ovs_intree_kmod_configs),$($(c))))
 PKG_CONFIG_DEPENDS+=$(ovs_intree_kmod_configs)
 ifneq ($(ovs_intree_kmod_enabled),)
-  CONFIGURE_ARGS += --with-linux=$(LINUX_DIR)
+  ifeq ($(ovs_kmod_intree_not_supported),)
+    CONFIGURE_ARGS += --with-linux=$(LINUX_DIR)
+  else
+    $(warning XXX: openvswitch: intree kmods selected but not supported)
+  endif
 endif
 
 TARGET_CFLAGS += -flto -std=gnu99