Remove unused function parameters, part 2: replication

Hi hackers,

PFA a patch to remove unused function parameters in replication (means
focusing on src/backend/replication).

Those have been detected by a coccinelle script (that I need to polish before
sharing). It currently only focuses on static functions.

While reviewing the coccinelle script output, I did a bit of Archeology to know
where the oversights come from (which helps with review), and that gives:

off_t *offset in HandleUploadManifestPacket(): dc212340058b
PGOutputData *data in check_and_init_gencol(): 7054186c4ebe
ReorderBuffer *rb in ReorderBufferRestoreCleanup(): b89e151054a0
ReorderBuffer *rb in ReorderBufferMaybeMarkTXNStreamed(): 072ee847ad4c
ReplicationSlot *slot in ReorderBufferSerializedPath(): 8aa75e1384b1
ReorderBuffer *rb in ReorderBufferFreeSnap(): b89e151054a0
TransactionId xid in ReorderBufferReplay(): a271a1b50e9b
Oid relid in ApplyLogicalMappingFile(): b89e151054a0
RetainDeadTuplesData *rdt_data in can_advance_nonremovable_xid(): 228c37086855
RetainDeadTuplesData *rdt_data in resume_conflict_info_retention(): 0d48d393d465
StringInfo s in apply_handle_origin(): 665d1fad99e7

Regards,

-- 
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com