PC/SC: move reader feature detection to a separate function. Don't detect features of a reader that is in exclusive mode.
PC/SC: move reader feature detection to a separate function. Don't detect features of a reader that is in exclusive mode.

git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@4783 c6295689-39f2-0310-b995-f0e70906c6a9

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