makefile: use qstrip

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Makefile

@@ -373,8 +373,7 @@ endif
 
 ifeq ($(BR2_ENABLE_LOCALE_PURGE),y)
 LOCALE_WHITELIST=$(PROJECT_BUILD_DIR)/locales.nopurge
-LOCALE_NOPURGE=$(strip $(subst ",,$(BR2_ENABLE_LOCALE_WHITELIST)))
-#"))
+LOCALE_NOPURGE=$(call qstrip,$(BR2_ENABLE_LOCALE_WHITELIST))
 
 target-purgelocales:
 	rm -f $(LOCALE_WHITELIST)