Avoid error in recovery test if history file is not yet present

Error was detected when testing use of libpq sessions instead of psql
for polling queries.

Discussion: https://postgr.es/m/e86b6d2d-20d8-4ac9-9a98-165fff7db886@dunslane.net

Backpatch to all live branches

Author: adunstan

src/test/recovery/t/002_archiving.pl

@@ -96,7 +96,7 @@
 # creating a RECOVERYHISTORY.
 my $primary_archive = $node_primary->archive_dir;
 $caughtup_query =
-  "SELECT size IS NOT NULL FROM pg_stat_file('$primary_archive/00000002.history')";
+  "SELECT size IS NOT NULL FROM pg_stat_file('$primary_archive/00000002.history', true)";
 $node_primary->poll_query_until('postgres', $caughtup_query)
   or die "Timed out while waiting for archiving of 00000002.history";