libnftnl: drop unsupported configure option

--without-json-parsing is not a supported configure option.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

package/libs/libnftnl/Makefile

@@ -43,8 +43,7 @@ TARGET_CFLAGS += $(FPIC)
 
 CONFIGURE_ARGS += \
 	--enable-static \
-	--enable-shared \
+	--enable-shared
-	--without-json-parsing
 
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include/libnftnl