Commits

Wes McKinney authored 2eeaa95d492
ARROW-1248: [Python] Suppress return-type-c-linkage warning in Cython clang builds I also removed some other unused CMake cruft from the build system. I think the warning is innocuous, but these symbols in question will only be callable from C++: ``` $ nm -g pyarrow/lib.cpython-35m-x86_64-linux-gnu.so | grep unwrap 0000000000055ef0 T pyarrow_unwrap_array 0000000000058590 T pyarrow_unwrap_batch 0000000000054690 T pyarrow_unwrap_buffer 0000000000057d90 T pyarrow_unwrap_column 0000000000054df0 T pyarrow_unwrap_data_type 0000000000055640 T pyarrow_unwrap_field 0000000000055af0 T pyarrow_unwrap_schema 0000000000058190 T pyarrow_unwrap_table 0000000000057880 T pyarrow_unwrap_tensor ``` Author: Wes McKinney <wes.mckinney@twosigma.com> Closes #888 from wesm/ARROW-1248 and squashes the following commits: 986cf889 [Wes McKinney] Suppress return-type-c-linkage warning in Cython clang builds. Remove other python CMake cruft