sanders: Migrate to function blob_fixup() for patching blobs

Change-Id: I45e3454ecd8f5af17b00e6ad2b3001fc82190e88

extract-files.sh

@@ -17,6 +17,13 @@
 
 # If we're being sourced by the common script that we called,
 # stop right here. No need to go down the rabbit hole.
+
+function blob_fixup() {
+    case "${1}" in
+
+   esac
+}
+
 if [ "${BASH_SOURCE[0]}" != "${0}" ]; then
     return
 fi