package/expect: download tarball instead of cvs

package/expect: download tarball instead of cvs

More than 3 years after the 5.45.3 release, a tarball for that release
was uploaded to sourceforge.net. The differences between this tarball
and the CVS checkout are minimal:

- There are no CVS directories, of course, but we don't need them.
- File timestamps are different.
- expect.tests is missing, but we don't execute tests anyway.
- configure script is different, but we AUTORECONF anyway.
- 'fixcat' script is missing, but it is not called anywhere.

Since sourceforge.net has broken CVS downloads, now is a good time to
switch away from it.

While we're at it, add a hash file including license.

Fixes:
http://autobuild.buildroot.net/results/db3/db33d4fa507fb3b4132423cd0a7e25a1fe6e4105
http://autobuild.buildroot.net/results/b6d/b6d927dcc73ac8d754422577dacefff4ff918a5c
http://autobuild.buildroot.net/results/23d/23d1034b33d0354de15de2ec4a8ccd0603e8db78
http://autobuild.buildroot.net/results/127/1272a3aa3077e434c9805ec3034f35e6fcc330d4

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>