Do not trap ^C in build_oai, and remove unused bash function

cmake_targets/build_oai

@@ -59,7 +59,6 @@ BUILD_ECLIPSE=0
 NR="False"
 OPTIONAL_LIBRARIES="telnetsrv enbscope uescope nrscope"
 RU=0
-trap handle_ctrl_c INT
 
 function print_help() {
   echo_info "

cmake_targets/tools/build_helper

@@ -967,23 +967,3 @@ do
         fi
 done
 }
-
-
-# get from http://www.linuxjournal.com/content/validating-ip-address-bash-script
-validate_ip() {
-
-local  ip=$1
-local  stat=1
-
-if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
-    OIFS=$IFS
-    IFS='.'
-    ip=($ip)
-    IFS=$OIFS
-    [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
-        && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
-    stat=$?
-fi
-
-return $stat
-}