x86: h264qpel: int --> ptrdiff_t for some line_size parameters
x86: dsputil: ff_h263_*_loop_filter declarations to a more suitable place
x86: dsputil: Refactor some ff_{avg|put}_pixels function declarations
x86: dsputil: cosmetics: Remove two pointless variable indirections
x86: dsputil: Move some ifdefs to avoid unused variable warnings