Simplify and make better cojerency of gcc general options

remain issues: -m32 set in only some placed (not changed) -std=gnu99 is also partially set (can't compile if set everywhere)



git-svn-id: http://svn.eurecom.fr/openair4G/trunk@6197 818b1a75-f10b-46b9-bf7c-635c3b92a50f