Add a note that does not work with 32bit MSVC

[TumoiYorozu]

Added a note that the ACL does not support 32bit MSVC projects.

I had submitted a PR a long time ago, but it was closed because I was too busy. I have corrected the advised points. #24

Sometimes my tweets to address this error still get retweeted, so I thought it would be better to put it in the official documentation)