Changes

Use C99 (u)int64_t instead of MSVC __int64 extension

Use time_t instead of MSVC __time64_t

The documentation reads:

> `time` is a wrapper for `_time64` and `time_t` is, by default,
> equivalent to `__time64_t`. If you need to force the compiler to
> interpret `time_t` as the old 32-bit `time_t`, you can define
> `_USE_32BIT_TIME_T`.

https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/time-time32-time64?view=msvc-170

Use C99 fixed-width integers in bigarray

Fully use C99 stdint.h fixed-width integers

Define intnat/uintnat with C99 intptr_t/uintptr_t

Use C99 inttypes.h fixed-width format macros

Define and use CAML_PRI.NAT and CAML_PRI.SZT

For consistency with C99 inttypes.h format specifiers.

s/alloced/allocated/g

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