Use wget in place of curl

This is the only line that requires curl. Other than that, Live Build
already depends on wget (through debootstrap), so let's use it as it's
already a requirement.

auto/config

@@ -55,7 +55,7 @@ done
 eval set -- "$temp"
 
 # Resolve release name
-dist=$(curl -s $kali_mirror/dists/$dist/Release | awk '/^Codename:/ {print $2}')
+dist=$(wget -q -O- $kali_mirror/dists/$dist/Release | awk '/^Codename:/ {print $2}')
 if [ -z "$dist" ]; then
 	echo "ERROR: Build release could not be resolved"
 	exit 1