message: Use os.path.sep in parquet-amalgamation include_dirs and source_files
diff: @@ -7,8 +7,8 @@ header_file = os.path.join(amal_dir, "parquet-extension.hpp")
  source_file = os.path.join(amal_dir, "parquet-extension.cpp")
  temp_source = 'parquet-extension.cpp.tmp'
  -include_directories = ['extension/parquet/include', 'third_party/parquet', 'third_party/snappy', 'third_party/thrift', 'third_party']
  -source_files = ['extension/parquet/parquet-extension.cpp', 'third_party/parquet/parquet_constants.cpp', 'third_party/parquet/parquet_types.cpp', 'third_party/thrift/protocol/TProtocol.cpp', 'third_party/thrift/transport/TTransportException.cpp', 'third_party/thrift/transport/TBufferTransports.cpp', 'third_party/snappy/snappy.cc', 'third_party/snappy/snappy-sinksource.cc']
  +include_directories = [os.path.sep.join(x.split('/')) for x in ['extension/parquet/include', 'third_party/parquet', 'third_party/snappy', 'third_party/thrift', 'third_party']]
  +source_files = [os.path.sep.join(x.split('/')) for x in ['extension/parquet/parquet-extension.cpp', 'third_party/parquet/parquet_constants.cpp', 'third_party/parquet/parquet_types.cpp', 'third_party/thrift/protocol/TProtocol.cpp', 'third_party/thrift/transport/TTransportException.cpp', 'third_party/thrift/transport/TBufferTransports.cpp', 'third_party/snappy/snappy.cc', 'third_party/snappy/snappy-sinksource.cc']]
  def generate_amalgamation(source_file, header_file):
  def copy_if_different(src, dest):
  