0.20.0rc1: Broken -logthreadnames on gitian builds #18652
Description
On 0.20.0rc1, or on just a gitian build against master (4702cad), the debug.log contains empty thread names:
2020-04-15T12:37:41Z [] Bitcoin Core version v0.20.0rc1 (release build)
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2020-04-15T12:37:41Z [] Config file arg: logthreadnames="1"
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Tested on Linux Mint 19.3 (x86) and ODROID-HC1 (ARM, bionic).