makebootable once Installed did its job

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24660 a95241bf-73f2-0310-859d-f6bbb57e9c96

data/system/boot/InstallerFinishScript

@@ -1,5 +1,20 @@
 #!/bin/sh
 ## The installer finish script.
 
+mount=$1
+
+if [ -z $mount ]; then
+	echo "Usage: $0 volume"
+	exit 1
+fi
+
+if [ ! -d $mount ]; then
+	echo "$mount isn't mounted"
+	exit 1
+fi
+
+mkdir -p "$mount/var/tmp"
+
+makebootable $mount