A slightly "warmenhoved" patch from Ignacio Vazquez-Abrams by way of
Fedora's RPM to prevent switchspell needing an executable stack. See
https://bugzilla.redhat.com/show_bug.cgi?id=462822 for the original bug
report, and
http://cvs.fedoraproject.org/viewvc/rpms/purple-plugin_pack/devel/purple-plugin_pack-2.4.0-switchspell-execstack.patch
for the original patch.
Fixes #534