Add missing void to updateclientlist definition
Caught by -pedantic implying -Wstrict-prototypes for OpenBSD's 16.0.6 Clang. ref. https://git.suckless.org/dwm/commit/5687f4696472ba6029bbba18e293e3e8b9e154ea.html
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Caught by -pedantic implying -Wstrict-prototypes for OpenBSD's 16.0.6 Clang. ref. https://git.suckless.org/dwm/commit/5687f4696472ba6029bbba18e293e3e8b9e154ea.html