BUG #19068: postgresql-server-dev-17 from apt.postgresql.org installs libpq-int.h for 18 version

The following bug has been logged on the website:

Bug reference: 19068
Logged by: RekGRpth
Email address: rekgrpth@gmail.com
PostgreSQL version: 17.6
Operating system: Ubuntu 24
Description:

postgresql-server-dev-17 from apt.postgresql.org installs libpq-int.h for 18
version
```
/usr/include/postgresql/internal/libpq-int.h:47:10: fatal error:
libpq/pg-gssapi.h: No such file or directory
47 | #include "libpq/pg-gssapi.h"
| ^~~~~~~~~~~~~~~~~~~
```

libpq/pg-gssapi.h appears only in 18 in commit e92c063