[WT-6160] Fix format failure caused by stack overwrite - MongoDB Jira

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The format program fails doing incremental backups with this signature:

t: FAILED: copy_blocks/283: rfd == -1

(gdb) where

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#1  0x00007fce4e595801 in __GI_abort () at abort.c:79

#2  0x0000564f573183e8 in testutil_die (e=0, fmt=0x564f57533227 "%s/%d: %s") at misc.c:66

#3  0x0000564f573038af in copy_blocks (session=0x564f584d0db8, bkup_c=0x7fce2c00ad00,

    name=0x7fce2c00a030 "WiredTigerHS.wt") at backup.c:283

#4  0x0000564f573043ce in backup (arg=0x0) at backup.c:460

#5  0x00007fce4e94d6db in start_thread (arg=0x7fce33fff700) at pthread_create.c:463

#6  0x00007fce4e67688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

duplicates

WT-6686 stack-buffer-overflow in test/format on 4.2 branch

is duplicated by

WT-6176 Timed Out: format-stress-sanitizer-smoke-test on Ubuntu 18.04 Stress tests [WiredTiger (develop) @ 2fd82090]

WT-6727 compatibility-test-for-newer-releases failed with SIGSEGV