sha1dc: use proper string functions on Python 2/3
PyString_FromStringAndSize doesn't exist on Python 3: we need
to use PyUnicode_FromStringAndSize.
The extension now compiles without warnings on Python 2 and 3.
Differential Revision: https://phab.mercurial-scm.org/D7878
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.