Prevent redeclaration of typedef TocEntry.

Commit 9c02e3a986 added a forward declaration for this typedef that
caused redeclarations, which is not valid in C99.  To fix, add some
preprocessor guards to avoid a redefinition, as is done elsewhere
(e.g., commit 382092a0cd).

Per buildfarm.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8ec0aaeae09482925d2d15ce4a91f6953bdb1566

Modified Files
--------------
src/bin/pg_dump/pg_backup.h          | 3 +++
src/bin/pg_dump/pg_backup_archiver.h | 3 +++
2 files changed, 6 insertions(+)

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