PARQUET-1220: Don't build Thrift examples and tutorials in the ExternalProject
PARQUET-1220: Don't build Thrift examples and tutorials in the ExternalProject

Author: Korn, Uwe <Uwe.Korn@blue-yonder.com>

Closes #440 from xhochy/PARQUET-1220 and squashes the following commits:

de2ee1b [Korn, Uwe] PARQUET-1220: Don't build Thrift examples and tutorials in the ExternalProject

wesm/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,majetideepak/parquet-cpp,wesm/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp,majetideepak/parquet-cpp,majetideepak/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,majetideepak/parquet-cpp,wesm/parquet-cpp,wesm/parquet-cpp