mem.c - fprintf Compiler Warning

Commit 93e8ba1b causes the following compiler warning on Windows (x86/x64):

lib\isc\mem.c(2238): warning C4477: 'fprintf' : format string '%d' requires an argument of type 'int', but variadic argument 3 has type 'LONGLONG'

Replacing PRIdFAST32 with PRIu64 in lib\isc\mem.c (lines 2238 and 2330) resolves it.