fix build warnings of uint64_t's print #23
Merged
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1 Change u_int64_t to uint64_t as u_int64_t is not portable in C, see [https://stackoverflow.com/questions/42979055/should-i-use-c-types-uint8-t-uint64-t-or-u-int8-t-u-int64-t](u_int64_t vs uint64_t).

2 Fix build warnings of uint64_t's print, as uint64_t is 'unsigned long long' in Mac, but is 'unsigned long int' in linux.