Add missing void in named_config_getdefault() definition [v9.16]

Merged Ondřej Surý requested to merge ondrej-add-missing-void-in-named_config_default-v9_16 into v9_16

The named_config_getdefault() was missing void in the function definition. This broke clang-15 that didn't match the declaration that had the void in the argument with the definition that hadn't.

Backported from !6259 (merged)

Edited by Ondřej Surý

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