qt: change use of BR2_JLEVEL to PARALLEL_JOBS

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/qt/qt.mk

@@ -487,7 +487,7 @@ define QT_CONFIGURE_CMDS
 		PKG_CONFIG_SYSROOT_DIR="$(STAGING_DIR)" \
 		PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
 		PKG_CONFIG_PATH="$(STAGING_DIR)/usr/lib/pkgconfig:$(PKG_CONFIG_PATH)" \
-		MAKEFLAGS="$(MAKEFLAGS) -j$(BR2_JLEVEL)" ./configure \
+		MAKEFLAGS="$(MAKEFLAGS) -j$(PARALLEL_JOBS)" ./configure \
 		$(if $(VERBOSE),-verbose,-silent) \
 		-force-pkg-config \
 		$(QT_CONFIGURE_OPTS) \