Create per-OS named packages when deploying

.travis.yml

@@ -57,7 +57,7 @@ script:
 deploy:
   provider: releases
   api_key: $GITHUB_API_KEY
-  file: curly.tar.xz
+  file: curly-$TRAVIS_OS_NAME.tar.xz
   skip_cleanup: true
   on:
     tags: true

scripts/ci/build-package.sh

@@ -12,5 +12,5 @@ for exe; do
 	cp -r bin/$exe share/*/$exe-*/* "$tmp/$full"
 	tar -C "$tmp" -c .
 	rm -r "$tmp"
-    ) | xz > "$exe.tar.xz"
+    ) | xz > "$exe-$TRAVIS_OS_NAME.tar.xz"
 done