[PATCH] More bindings for gnome_keyring / platform_specific_client_providers

Hi folks,

over a year ago, I submitted a patch to make the
svn_auth_get_platform_specific_client_providers perl bindings work, to
allow git-svn to work with gnome_keyring. Since then, I've been working
on some further improvements, which I've attached as patches.

For consistency, I've also fixed the
svn_auth_get_platform_specific_client_providers bindings for python and
ruby, even though I don't really require them.

The more fun change is the addition of a new binding that allows you to
set a gnome_keyring prompt function: Using this, git-svn can ask for a
keyring unlock password if the keyring is not locked yet (fixing a
long-standing annoyance where I previously had to open some GUI-thingy
to unlock the keyring before using git-svn). Again, I've spent some time
figuring out the python and ruby bindings as well, and made this work
there too.

All changes have been tested using two example scripts (needed changes
included in the patches) for python and ruby and using git-svn for perl
(for lack of any example scripts). The ruby example script is new, since
there was no example that accessed a remote url yet. I also fixed the
python example I used, since it didn't work on trunk.

I've included testcases for perl and python, but my lacking Ruby skills
didn't manage to produce testcases for Ruby (there's not much to test,
anyway...)

Patches are against svn trunk (r1227522), but also apply with just a
single trivial conflict to 1.6.17.

Let me know if there's any further improvments required.

Gr.

Matthijs