Use 7zip MINGW package instead of MSYS

It is faster and more up-to-date.

Author: larskanis

recipes/archive-7z/70-create-archive.rake

@@ -1,10 +1,10 @@
 file archivefile => sandbox_task.sandboxfiles do
   rm_f archivefile
   msys_sh <<-EOT
-    pacman -S --needed --noconfirm p7zip
+    pacman -S --needed --noconfirm $MINGW_PACKAGE_PREFIX-7zip
   EOT
 
   chdir "recipes/sandbox" do
-    sh "sh 7z a -bd ../../#{archivefile} #{sandboxdir.sub("recipes/sandbox/", "")} | ruby -ne \"STDERR.print '.'\""
+    sh "7z a -bd -snl ../../#{archivefile} #{sandboxdir.sub("recipes/sandbox/", "")} | ruby -ne \"STDERR.print '.'\""
   end
 end