Add back MAX_ATR_SIZE which was erroneously removed in r4611. Fixes mingw32 build.
Add back MAX_ATR_SIZE which was erroneously removed in r4611. Fixes mingw32 build.

git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@4622 c6295689-39f2-0310-b995-f0e70906c6a9

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