cmake: 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/cmake/cmake.mk

@@ -5,7 +5,7 @@ define HOST_CMAKE_CONFIGURE_CMDS
  (cd $(@D); \
 	LDFLAGS="$(HOST_LDFLAGS)" \
 	CFLAGS="$(HOST_CFLAGS)" \
-	./bootstrap --prefix=$(HOST_DIR)/usr --parallel=$(BR2_JLEVEL) \
+	./bootstrap --prefix=$(HOST_DIR)/usr --parallel=$(PARALLEL_JOBS) \
  )
 endef