TT#32751 Update build instruction

Change-Id: I496ab27854bdae2524681d102f6563a295bed57d

README.txt

@@ -2,11 +2,12 @@ Instructions how to build the Grml-Sipwise Deployment ISO
 =========================================================
 
 Make sure you have grml2usb >=0.11.6 installed (providing grml2iso).
-Grab a 64bit Grml ISO (like grml64_2011.12.iso) from http://grml.org/download/
 
 Execute:
 
-  % sudo grml2iso -c ngcp/deployment/trunk/grml-live/templates -o grml-sipwise_$(date +%Y.%m.%d).iso grml64_2011.12.iso
+  % make all
 
-This will generate grml-sipwise_...iso, providing the custom bootsplash
+  % ./build_iso.sh compat <grml.iso> <mr version> <Debian dist>
+
+This will generate ISO file, providing the custom bootsplash
 with Sipwise specific boot menu entries.