Fix 64-bit build on Mac
Fix 64-bit build on Mac

BUG=http://code.google.com/p/skia/issues/detail?id=524
Thanks to mmaerean@adobe.com for the patch.
Review URL: https://codereview.appspot.com/6022058

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@3686 2bbb7eff-a529-9590-31e7-b0007b416f81

mrobinson/skia,Cue/skia,metajack/skia,mrobinson/skia,metajack/skia,mrobinson/skia,Cue/skia,metajack/skia,metajack/skia,mrobinson/skia,Cue/skia,mrobinson/skia,Cue/skia