bug#32957: Python uses a bundled expat

[Marius Bakke]

Leo Famulari <address@hidden> writes:

> On Sat, Oct 06, 2018 at 04:58:13PM +0200, Marius Bakke wrote:
>> Python 2 and 3 are using a bundled Expat (residing under Modules/).
>> 
>> This has been the cause of security vulnerabilities in the past and
>> should be changed to use Expat from Guix.
>
> Looks like Debian uses an external Expat to fill the dependency, so it
> should be possible:
>
> https://packages.debian.org/stretch/python3.5-minimal
>
> We should look into the difference between the bundled Expat and
> upstream Expat.

Looking at the Debian package did help me figure out how to make it use
system Expat.  We needed this patch:
<https://salsa.debian.org/cpython-team/python3/blob/master/debian/patches/setup-modules.diff>.

That patch only works *after* the configure step and requires
regenerating some files (see the rules file around PyExpat), so I took a
simpler approach.

Fixed in d1659c0fb27c4f71c8ddc6a85d3cd9f3a10cca97.

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