fix the libconfig setting for ubuntu 14.04

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@6128 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/build_oai.bash

@@ -274,12 +274,14 @@ build_enb(){
 	fi
     fi
     
+    if [ $UBUNTU_REL = "12.04" ]; then 
 	output=$(check_for_machine_type 2>&1) 
 	MACHINE_ARCH=$?
    	if [ $MACHINE_ARCH -eq 64 ]; then
 	    SOFTMODEM_DIRECTIVES="$SOFTMODEM_DIRECTIVES LIBCONFIG_LONG=1 "
 	    OAISIM_DIRECTIVES="$OASIM_DIRECTIVES LIBCONFIG_LONG=1 "
 	fi
+    fi
     
     echo_success "SOFTMODEM Compilation directives: $SOFTMODEM_DIRECTIVES"
     echo_success "OAISIM Compilation directives:    $OAISIM_DIRECTIVES"