bdiff: convert more longs to int64_t...
bdiff: convert more longs to int64_t
MSVC previously flagged these where the function is stored in a pointer:
bdiff.c(284) : warning C4028: formal parameter 1 different from declaration
bdiff.c(284) : warning C4028: formal parameter 2 different from declaration
bdiff.c(284) : warning C4028: formal parameter 3 different from declaration
bdiff.c(284) : warning C4028: formal parameter 4 different from declaration