Remove more features I won't be using.

tools/runosbuild

@@ -9,7 +9,6 @@
 #
 # * Knows what target to export based on the extensions.
 # * Knows what the exported filename based on the extensions.
-# * Supports building natively or in a VM via osbuildvm.
 # * Runs only the minimal required commands as root, and
 #   chowns the resulting files to the user
 # * Supports exporting an extra ostree commit and pulling that
@@ -54,8 +53,7 @@ if [ $ARCH == $HOST_ARCH -a $VM == 0 ]; then
     SUDO="sudo"
     OSBUILD="sudo osbuild"
 else
-    SUDO=
-    OSBUILD="osbuildvm/osbuildvm --arch=$ARCH"
+    echo "I don't support building for non-x86 nor in a VM."
 fi
 
 EXPORT_ARGS="--export $EXPORT"