openvswitch: cleanup makefile (remove explicit build rules)

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

net/openvswitch/Makefile

@@ -24,14 +24,16 @@ PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE_VERSION:=58be9c9fd732b5bdd3d4c2e9b8cc2313f570094d
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 
+PKG_BUILD_PARALLEL:=1
+PKG_FIXUP:=autoreconf
+PKG_INSTALL:=1
+
 SUPPORTED_KERNELS:=LINUX_3_8||LINUX_3_10||LINUX_3_13||LINUX_3_14||LINUX_3_18||LINUX_4_0
 
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/kernel.mk
 $(call include_mk, python-package.mk)
 
-PKG_FIXUP=libtool
-
 define Package/openvswitch/Default
   SECTION:=net
   CATEGORY:=Network
@@ -112,35 +114,7 @@ CONFIGURE_ARGS += --enable-ndebug
 CONFIGURE_ARGS += --disable-ssl
 CONFIGURE_ARGS += --enable-shared
 
-TARGET_CFLAGS += -flto
-
-define Build/Configure
-	(cd $(PKG_BUILD_DIR); \
-		autoreconf -v --install --force || exit 1 \
-	);
-	$(call Build/Configure/Default,$(CONFIGURE_ARGS))
-endef
-
-KCFLAGS=
-ifeq ($(CONFIG_GCC_VERSION_4_9),y)
-KCFLAGS:=-Wno-error=date-time
-endif
-
-define Build/Compile
-	$(MAKE) -C $(PKG_BUILD_DIR) \
-		$(TARGET_CONFIGURE_OPTS) \
-		CFLAGS="-I$(PKG_BUILD_DIR)/lib $(TARGET_CFLAGS) -std=gnu99" \
-		LDFLAGS="-L$(PKG_BUILD_DIR)/lib $(TARGET_LDFLAGS)" \
-		LDFLAGS_MODULES="$(TARGET_LDFLAGS) -L$(PKG_BUILD_DIR)/lib" \
-		STAGING_DIR="$(STAGING_DIR)" \
-		DESTDIR="$(PKG_INSTALL_DIR)/usr" \
-		CROSS_COMPILE="$(TARGET_CROSS)" \
-		ARCH="$(LINUX_KARCH)" \
-		SUBDIRS="$(PKG_BUILD_DIR)/datapath/linux" \
-		PATH="$(TARGET_PATH)" \
-		EXTRA_CFLAGS="$(KCFLAGS)" \
-		KCC="$(KERNEL_CC)"
-endef
+TARGET_CFLAGS += -flto -std=gnu99
 
 define Package/openvswitch/install
 	$(INSTALL_DIR) $(1)/etc/openvswitch