add debug echo

Author: pennam

extras/package.sh

@@ -51,6 +51,7 @@ set +e
 ./mbed-os-to-arduino -b origin/latest -a NOPE:NOPE
 set -e
 for variant in $VARIANTS; do
+echo "Recompiling for variant $variant"
 ./mbed-os-to-arduino $variant:$variant
 done