libavcodec/pixblockdsp.c(58) : warning C4028: formal parameter 1 different from declaration
libavcodec/pixblockdsp.c(63) : warning C4028: formal parameter 1 different from declaration
libavcodec/pixblockdsp.c(66) : warning C4028: formal parameter 1 different from declaration
This avoids SIMD-optimized functions having to sign-extend their
line size argument manually to be able to do pointer arithmetic.
Also adjust parameter names to be "stride" everywhere.