drop need for argument to "noderun" when building binaries on VMs

git-svn-id: svn://localhost/ardour2/branches/3.0@9195 d708f5d6-7413-0410-9779-e7cbd77b26cf

tools/linux_packaging/noderun

@@ -1,10 +1,8 @@
 #!/bin/sh
 
-BASE=$1
-
-if [ x$BASE = "x" ] ; then 
-   exit 1
-fi
+BASE=$(readlink -f $0)
+BASE=$(dirname $BASE) # up one
+BASE=$(dirname $BASE) # up one more
 
 if mount | grep --silent vmshare ; then
     sudo mount -t vboxsf vmshare $HOME/vmshare