Add downloaded and generated archive files to gitignore

.gitignore

diff --git a/.gitignore b/.gitignore
index d181c30..b6fa20c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,3 +33,8 @@
 /mingw
 /spidermonkey
 /binaryen
+
+# Generated and downloaded packages
+*.zip
+*.tar.gz
+*.tar.xz