pgsql: pg_restore: fix incompatibility with old directory-format dumps.

pg_restore: fix incompatibility with old directory-format dumps.

pg_restore failed to restore large objects (blobs) out of
directory-format dumps made by versions before PG v12.
That's because, due to a bug fixed in commit 548e50976, those
old versions put the wrong filename into the BLOBS TOC entry.
Said bug was harmless before v17, because we ignored the
incorrect filename field --- but commit a45c78e32 assumed it
would be correct.

Reported-by: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Author: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Discussion: https://postgr.es/m/CAFj8pRCrZ=_e1Rv1N+6vDaH+6gf=9A2mE2J4RvnvKA1bLiXvXA@mail.gmail.com
Backpatch-through: 17

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/166b4f4560d68e2bcf0f82eb898ac5ee15147b82

Modified Files
--------------
src/bin/pg_dump/pg_backup_directory.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)