toolchain/crosstool-ng: change use of BR2_JLEVEL to PARALLEL_JOBS

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

toolchain/toolchain-crosstool-ng/crosstool-ng.mk

@@ -81,7 +81,7 @@ $(STAMP_DIR)/ct-ng-toolchain-installed: $(STAMP_DIR)/ct-ng-toolchain-built
 #       depending on the selected C library. Those deps are added later
 
 $(STAMP_DIR)/ct-ng-toolchain-built: $(CTNG_DIR)/.config
-	$(Q)$(call ctng,build.$(BR2_JLEVEL))
+	$(Q)$(call ctng,build.$(PARALLEL_JOBS))
 	$(Q)printf "\n"
 	$(Q)touch $@