Log Message:
Changes 20141023:
* Update to the current lavf API and fix memory leak when using --seek
* x86inc: Make INIT_CPUFLAGS support an arbitrary number of cpuflags
* x86: Minor pixel_ssim_end4 improvements
* x86: Faster quant_4x4x4
* configure: improve cc_check for clang and ICL to not ignore unknown options
* checkasm: Only call x264_cpu_detect() once