Fix #78983: pdo_pgsql config.w32 cannot find libpq-fe.h

[ranvis]

When configured with a path specified.

[cmb69]

Hmm, which library distribution do you use?

Also, please note that PHP-7.2 is no longer actively supported, so the PR has to target PHP-7.3.

[ranvis]

From this URL:
https://www.enterprisedb.com/downloads/postgres-postgresql-downloads
SHA1(postgresql-12.1-1-windows-x64.exe)= 4c79e8d1457387eeecc083d44e55151a27bc4ac7

Also, please note that PHP-7.2 is no longer actively supported, so the PR has to target PHP-7.3.

I'm sorry.
I've referenced https://github.com/php/php-src/blob/master/CONTRIBUTING.md but it is out of date then.
Should I close and repost the PR's?

[cmb69]

Ah, indeed, the PostgreSQL distribution has this folder structure (I'm having version 10).

And, yes, that README.mdCONTRIBUTING.md is not up-to-date; I shall fix it. There is no need to make a new PR; you can simply rebase onto PHP-7.3 (should be possible via Github; just press Edit beside the PR title).

[cmb69]

Thanks for the PR! It seems to me that the AppVeyor test failures are unrelated, so I've applied this as 3e35b08.