build(chore): use DIST to label kindle artifacts

Makefile

@@ -151,7 +151,7 @@ kindleupdate: all
 	# ensure that the binaries were built for ARM
 	file $(INSTALL_DIR)/koreader/luajit | grep ARM || exit 1
 	# remove old package if any
-	rm -f koreader-kindle-$(MACHINE)-$(VERSION).zip
+	rm -f koreader-$(DIST)-$(MACHINE)-$(VERSION).zip
 	# Kindle launching scripts
 	ln -sf ../$(KINDLE_DIR)/extensions $(INSTALL_DIR)/
 	ln -sf ../$(KINDLE_DIR)/launchpad $(INSTALL_DIR)/
@@ -161,22 +161,22 @@ kindleupdate: all
 	# create new package
 	cd $(INSTALL_DIR) && pwd && \
 		zip -9 -r \
-			../koreader-kindle-$(MACHINE)-$(VERSION).zip \
+			../koreader-$(DIST)-$(MACHINE)-$(VERSION).zip \
 			extensions koreader $(KINDLE_LEGACY_LAUNCHER) \
 			-x "koreader/resources/fonts/*" "koreader/ota/*" \
 			"koreader/resources/icons/src/*" "koreader/spec/*"
 	# generate kindleupdate package index file
-	zipinfo -1 koreader-kindle-$(MACHINE)-$(VERSION).zip > \
+	zipinfo -1 koreader-$(DIST)-$(MACHINE)-$(VERSION).zip > \
 		$(INSTALL_DIR)/koreader/ota/package.index
 	echo "koreader/ota/package.index" >> $(INSTALL_DIR)/koreader/ota/package.index
 	# update index file in zip package
-	cd $(INSTALL_DIR) && zip -u ../koreader-kindle-$(MACHINE)-$(VERSION).zip \
+	cd $(INSTALL_DIR) && zip -u ../koreader-$(DIST)-$(MACHINE)-$(VERSION).zip \
 		koreader/ota/package.index
 	# make gzip kindleupdate for zsync OTA update
 	# note that the targz file extension is intended to keep ISP from caching
 	# the file, see koreader#1644.
 	cd $(INSTALL_DIR) && \
-		tar czafh ../koreader-kindle-$(MACHINE)-$(VERSION).targz \
+		tar czafh ../koreader-$(DIST)-$(MACHINE)-$(VERSION).targz \
 		-T koreader/ota/package.index --no-recursion
 
 koboupdate: all