build.sh: switch to upstream mantle
coreos/mantle#888 merged, switch back to upstream mantle
@@ -54,8 +54,7 @@ rm /root/src -rf
# Part of general image management
dnf -y install awscli
cd /root
-# We want https://github.com/coreos/mantle/pull/888
-git clone --branch rhcos_general https://github.com/arithx/mantle
+git clone https://github.com/coreos/mantle
cd mantle
# Add components as necessary
./build ore kola kolet
