title: uint24_t and uint48_t in MinGW
body: <p>I'm looking for uint24_t and uint48_t types in GCC and MinGW. I know neither are standardized, but I've come across references to them online, and I'm trying to figure out:</p>
  
  <ol>
  <li>What header I need to include for them.</li>
  <li>Whether they are cross-platform (at least on Windows, Linux, and Mac OSX), or just for specific targets.</li>
  <li>What their names are. uint24_t,  __uint24, __uint24_t?</li>
  </ol>