Define _TIME_BITS=64 globally

[am11]

I wasn't able to test it with docker (wolfcw/libfaketime#437 (comment)), and attempts to emulate arm32 failed on osx-arm64 and win-x64. However, I can confirm that size of st_atime on Debian armel goes from 4 to 8 with _TIME_BITS=64 using this C program:

// FILE: time.c
// COMMAND: cc -D_TIME_BITS=64 time.c
// PLATFORM: Debian armel

#include <sys/types.h>
#include <sys/stat.h>

#include <stdio.h>
#include <unistd.h>

int main(void)
{
    struct stat sb;

    printf("sizeof time_t: %zu\n", sizeof(time_t));
    printf("sizeof stat timestamp: %zu\n", sizeof(sb.st_atime));

    return 0;
}

Contributes to #96460 (pending confirmation once daily build is available)

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[jkotas]

Thank you!