python-xmlsec

Fix build on CentOS 6 w/ xmlsec1-1.2.19-3

pkgconfig doesn't parse the XMLSEC_CRYPTO macro value correctly
from xmlsec1-1.2.19-3 on CentOS 6 (the Changelog
for [that RPM](https://centos.pkgs.org/6/centos-x86_64/xmlsec1-1.2.20-4.el6.x86_64.rpm.html)
suggests there's been some bugs).

```
2014-05-28 - Simo Sorce <simo@redhat.com> - 1.2.20-2
- Update pkg-config fix patch to apply w/o fuzz

...

2014-05-23 - Simo Sorce <simo@redhat.com> - 1.2.19-6
- Fix incomplete patch

2014-05-23 - Simo Sorce <simo@redhat.com> - 1.2.19-5
- Add patch to deal with different behavior of pkg-config in RHEL6
```

This change fixes the build for xmlsec1-1.2.19-3.