Fix for mingw/windows compile error

[robe2]

This is to fix mingw/windows compile issue.

References #276

I still need to check some things out like lower versions of PostgreSQL cause I only tested with PostgreSQL 19.

[robe2]

Okay works at a least as far back as PG14 which is all I care about.

And why the strlcpy references work fine in ogr_fdw.c is as I suspected, PostgreSQL has a fall back implementation for windows - https://doxygen.postgresql.org/strlcpy_8c_source.html

[robe2]

Going to close this out as the compile issue was already addressed by e39b0ff