Merge from vendor branch TNF:

Merge from vendor branch TNF:
Import liboauth-0.8.9 into the Packages Collection.

This is an updated version of the liboauth package in pkgsrc-wip by
Kamel Derouiche, modified by myself not to have nss, doxygen, perl and
graphviz pre-requisites.

        OAuth (Open Authorization) is an open standard that allows users to
        share their private resources (e.g.  photos, videos, contact lists)
        stored on one site with another site without having to hand out their
        username and password.

        OAuth allows users to hand out tokens instead of usernames and
        passwords to their data hosted by a given service provider.  Each
        token grants access to a specific site (e.g.  a video editing site)
        for specific resources (e.g.  just videos from a specific album) and
        for a defined duration (e.g.  the next 2 hours).

        Thus OAuth allows a user to grant a third party site access to their
        information stored with another service provider, without sharing
        their access permissions or the full extent of their data.

        OAuth is a service that is complementary to but distinct from OpenID.

        liboauth is a collection of C functions implementing the OAuth
        Core 1.0 standard API.  liboauth provides basic functions to
        escape and encode parameters according to OAuth specs and
        offers high-level functions to sign requests or verify
        signatures.

Necessary these days for twitter applications; useful for flickr and many
others...