Remove unused function

gitlab/functions.sh

@@ -203,18 +203,6 @@ prepare_build_env() {
 }
 
 
-# Appends a value to a variable if that is not already set
-# $1: variable name to append the value
-# $2: the value to be appended
-append_if_not_set() {
-  if [ -z "${1+abc}" ]; then
-    eval $1="$2"
-  elif [[ "${!1}" != "*${2}*" ]]; then
-    eval $1="${!1} $2"
-  fi
-}
-
-
 # Checks if an array contains a value
 # taken from here: https://stackoverflow.com/questions/3685970/check-if-an-array-contains-a-value
 # Parameters: <value-to-check> <array-variable>