cmake PG should ensure correct libdir, otherwise ports are broken on linux

[Fred Wright]

On Tue, 17 Sep 2024, Ken Cunningham wrote:

> Of course, if you over-write 64 bit libs with 32 bit libs of the same 
> name, or vice versa, in the same location, you are just hosed, ldconfig 
> or no ldconfig.
>
> Which is why linux has the lib32 and lib64 subfolders iin the first place.

I don't disagree, but OP claimed that Linux never looks in lib64, which I 
suspect is just an artifact of failing to run ldconfig.

Fred Wright