Windows: Apply OSGeo4W patches for Postgres (backport)

[neteler]

Backport of #4996 to G84 branch

Co-authored-by: @echoix

[echoix]

I know that for the grass (non grass-dev), the patches were different. Are we fine to place this change as-is?

[nilason]

I know that for the grass (non grass-dev), the patches were different. Are we fine to place this change as-is?

I would think so.

checking whether to use PostgreSQL... "yes"
checking for location of PostgreSQL includes... /c/OSGeo4W/include
checking for libpq-fe.h... yes
checking for location of PostgreSQL library... /d/a/grass/grass/mswindows/osgeo4w/lib
checking for PQsetdbLogin in -lpq... yes
checking for PQcmdTuples in -lpq... yes

...

  PostgreSQL support:         yes