rust-python3: useless python2 specific import

This python27_sys import prevents building with python3,
it had been previously removed in a5fa9140ce4c, but that
has been since pruned

Differential Revision: https://phab.mercurial-scm.org/D6415

rust/hg-cpython/src/lib.rs

@@ -1,54 +1,53 b''
 // lib.rs
 //
 // Copyright 2018 Georges Racinet <[e-mail]>
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 //! Python bindings of `hg-core` objects using the `cpython` crate.
 //! Once compiled, the resulting single shared library object can be placed in
 //! the `mercurial` package directly as `rustext.so` or `rustext.dll`.
 //! It holds several modules, so that from the point of view of Python,
 //! it behaves as the `cext` package.
 //!
 //! Example:
 //!
 //! ```text
 //! >>> from mercurial.rustext import ancestor
 //! >>> ancestor.__doc__
 //! 'Generic DAG ancestor algorithms - Rust implementation'
 //! ```
 
 #[macro_use]
 extern crate cpython;
 extern crate hg;
 extern crate libc;
-extern crate python27_sys;
 
 pub mod ancestors;
 mod cindex;
 mod conversion;
 pub mod dagops;
 pub mod discovery;
 pub mod exceptions;
 pub mod dirstate;
 pub mod filepatterns;
 
 py_module_initializer!(rustext, initrustext, PyInit_rustext, |py, m| {
     m.add(
         py,
         "__doc__",
         "Mercurial core concepts - Rust implementation",
     )?;
 
     let dotted_name: String = m.get(py, "__name__")?.extract(py)?;
     m.add(py, "ancestor", ancestors::init_module(py, &dotted_name)?)?;
     m.add(py, "dagop", dagops::init_module(py, &dotted_name)?)?;
     m.add(py, "discovery", discovery::init_module(py, &dotted_name)?)?;
     m.add(py, "dirstate", dirstate::init_module(py, &dotted_name)?)?;
     m.add(py, "filepatterns", filepatterns::init_module(py, &dotted_name)?)?;
     m.add(py, "GraphError", py.get_type::<exceptions::GraphError>())?;
     m.add(py, "PatternFileError", py.get_type::<exceptions::PatternFileError>())?;
     m.add(py, "PatternError", py.get_type::<exceptions::PatternError>())?;
     Ok(())
 });