fix the fu.... inserting og @echo in parts before a make goal and list of commans that start by a TAB
 that is not correct in makefiles: replaced by $(warning and $(info (the latest needs make version > 3.8, so ubuntu 12.04 is fine)



git-svn-id: http://svn.eurecom.fr/openair4G/trunk@6093 818b1a75-f10b-46b9-bf7c-635c3b92a50f