Under has_wal_read_bug, skip contrib/bloom/t/001_wal.pl.

Per buildfarm members snapper and kittiwake.  Back-patch to v10 (all
supported versions).

Discussion: https://postgr.es/m/20220116210241.GC756210@rfd.leadboat.com

contrib/bloom/t/001_wal.pl

@@ -5,6 +5,13 @@ use PostgresNode;
 use TestLib;
 use Test::More tests => 31;
 
+if (TestLib::has_wal_read_bug)
+{
+	# We'd prefer to use Test::More->builder->todo_start, but the bug causes
+	# this test file to die(), not merely to fail.
+	plan skip_all => 'filesystem bug';
+}
+
 my $node_master;
 my $node_standby;