alfred: Use standard Build/Compile rule

alfred isn't using any special rules in Build/Compile. It is cleaner to
directly use the global Build/Compile/Default instead of having a
functional similar copy in the package Makefile
Signed-off-by: NSven Eckelmann <sven@narfation.org>

alfred/Makefile

@@ -54,7 +54,7 @@ define Package/alfred/config
 	source "$(SOURCE)/Config.in"
 endef
 
-MAKE_ALFRED_FLAGS=\
+MAKE_FLAGS += \
 	CONFIG_ALFRED_VIS=$(if $(CONFIG_PACKAGE_ALFRED_VIS),y,n) \
 	CONFIG_ALFRED_GPSD=$(if $(CONFIG_PACKAGE_ALFRED_GPSD),y,n) \
 	CONFIG_ALFRED_CAPABILITIES=n \
@@ -65,12 +65,6 @@ MAKE_ALFRED_FLAGS=\
 TARGET_CFLAGS  += -ffunction-sections -fdata-sections -flto
 TARGET_LDFLAGS += -Wl,--gc-sections -fuse-linker-plugin
 
-define Build/Compile
-	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
-	LDFLAGS="$(TARGET_LDFLAGS)" \
-	$(MAKE) -C $(PKG_BUILD_DIR) $(MAKE_FLAGS) $(MAKE_ALFRED_FLAGS) all
-endef
-
 define Package/alfred/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	cp -fpR  $(PKG_BUILD_DIR)/alfred $(1)/usr/sbin/