Adjust pread/pwrite to return Status
Summary: Returning bytes_read causes the caller to call GetLastError() to report failure but the lasterror may be overwritten by then so we lose the error code. Fix up CMake file to include xpress source code only when needed. Fix warning for the uninitialized var. Closes https://github.com/facebook/rocksdb/pull/3795 Differential Revision: D7832935 Pulled By: anand1976 fbshipit-source-id: 4be21affb9b85d361b96244f4ef459f492b7cb2b
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