libmpdclient: pass PARALLEL_JOBS to NINJA_OPTS

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libmpdclient/libmpdclient.mk

@@ -20,7 +20,7 @@ LIBMPDCLIENT_CONF_OPTS += \
 	--buildtype $(if $(BR2_ENABLE_DEBUG),debug,release) \
 	--cross-file $(HOST_DIR)/etc/meson/cross-compilation.conf
 
-LIBMPDCLIENT_NINJA_OPTS = $(if $(VERBOSE),-v)
+LIBMPDCLIENT_NINJA_OPTS = $(if $(VERBOSE),-v) -j$(PARALLEL_JOBS)
 
 define LIBMPDCLIENT_CONFIGURE_CMDS
 	rm -rf $(@D)/build