test/format failure: null pointer passed to memcpy in bulk cursor insert

format-stress-pull-request-test failed on ! Ubuntu 20.04 UBSAN

Host: ec2-100-25-170-44.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-8483 Use diagnostics on CMake wt_obs target (#7258)

If strict is enabled, the intermediate wt_objs target in CMake
needs to compile with the diagnostic flag. This change corrects a
bug where our CMake build didn't apply the diagnostic flags to
the intermediate object library. | 02 Dec 21 06:15 UTC
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