force boa to use $(STRIP) vs the host strip. Reported by Thomas Petazzoni on uclibc ml

package/boa/boa.mk

@@ -59,7 +59,7 @@ $(BOA_WORKDIR)/.installed: $(BOA_WORKDIR)/src/boa $(BOA_WORKDIR)/src/boa_indexer
 	mkdir -p $(TARGET_DIR)/etc/boa
 	cp -f package/boa/boa.conf $(TARGET_DIR)/etc/boa
 	cp -f package/boa/mime.types $(TARGET_DIR)/etc/mime.types
-	strip --strip-all $(TARGET_DIR)/usr/sbin/boa $(TARGET_DIR)/usr/lib/boa/boa_indexer
+	$(STRIP) --strip-all $(TARGET_DIR)/usr/sbin/boa $(TARGET_DIR)/usr/lib/boa/boa_indexer
 	touch $(BOA_WORKDIR)/.installed
 
 boa:	uclibc $(BOA_WORKDIR)/.installed