run_trunnel.sh: Use 'find -exec' instead of a 'for' loop

# Get all .trunnel files recursively from that directory so we can support

# multiple sub-directories.

for file in `find ./src/trunnel/ -name '*.trunnel'`; do

  python -m trunnel ${OPTIONS} "$file"

done

find ./src/trunnel/ -name '*.trunnel' -exec python -m trunnel ${OPTIONS} {} \;

python -m trunnel ${OPTIONS} --write-c-files --target-dir=./src/ext/trunnel/