Fix for missing realpath on macOS

Signed-off-by: falkTX <falktx@falktx.com>

utils/generate-ttl.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# function not available on some systems
+# the realpath function is not available on some systems
 if ! which realpath &>/dev/null; then
     function realpath() {
         [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"

utils/package-osx-bundles.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 
+# the realpath function is not available on some systems
+if ! which realpath &>/dev/null; then
+    function realpath() {
+        [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+    }
+fi
+
 set -e
 
 DPF_UTILS_DIR="$(dirname $(realpath ${0}))"