Revisions to allow compiling under Windows-mingw64

[robe2]

This is to support pg_cron working on windows.

Note I compiled this using msys2-mingw64 but I'm using it under PostgreSQL Windows EDB installs. Seems to work fine. I tested with PG 16 and PG18 but made sure it compiled for PG13-PG18.

I had to make additional adjustments for PG < 15 cause I guess they improved windows headers in PG for 16 and above.

I did use Google AI assistant for some guidance.

The (int 32) casting in the UpdateJobRunDetail was needed, because otherwise I was getting an incompatible cast from int32 to pid_t * {aka long long int *}. I assumed that was better than changing the definition of

 UpdateJobRunDetail(int64 runId, int32 *job_pid, char *status, char *return_message, TimestampTz *start_time,
									TimestampTz *end_time);

To

 UpdateJobRunDetail(int64 runId, pid_t *job_pid, char *status, char *return_message, TimestampTz *start_time,
									TimestampTz *end_time);

But both variants worked.

[robe2]

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