pjsip: Remove unneded DShow base classes

Ignore-this: 1a56c46f2e0e3cb833bd48620be5ecf5

darcs-hash:20140807110740-56b4d-26c5ca0ddb361b998c2e96accbdedcd3b4b91bb0
pjsip: fix DirectShow video device backend

Ignore-this: 1b8ab06a3f3f81393ea0abfcebbe0939

- adapt build to autoconf
- remove traces of the dshow renderer, we use SDL

darcs-hash:20140807110816-56b4d-49532f2a7f9aefc84223432ef46c76a1d8540fde
pjsip: rename file

Ignore-this: e13a462383f62d0ef22e60605395bf27

darcs-hash:20140807111213-56b4d-72c4e87c00fa7c6c3346850fcc0aba64359d3c6b