Ignore autotools generated cache files

Ignore-this: 1a27267a17ecdb7e0a2fe081ecbf4d82

darcs-hash:20141016161204-56b4d-eff1ed46f966f8c57b7bb3bd89a96f7b5695c2db
Simplified code

Ignore-this: 6c352de6cacce50a39f7e6ef48ca83f4

darcs-hash:20141017093045-56b4d-d5af9802d6ddd51c3c28967c343c8b2931ab0f21
pjsip: relay found keyframe events from codec

Ignore-this: 8ec173b14daddf8302c8822e872a86f7

darcs-hash:20141021101118-56b4d-2024b550d203e39e29d9a6dbeb0fde880b92ef71