Merge branch 'curl' into 'master'

Do explicit mirror resolve with curl

See merge request archlinux/arch-boxes!154

build-host.sh

@@ -128,7 +128,7 @@ function main() {
   expect "# "
 
   # Explicitly lookup mirror address as we'd get random failures otherwise during pacman
-  send "host ${MIRROR}\n"
+  send "curl -sSo /dev/null ${MIRROR}\n"
   expect "# "
 
   # Install required packages