GNUmakefile: remove sleep from UNIX_PROGS to avoid warning
#6960
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When running
./util/build-gnu.shI noticed the following two warnings:They are shown because
sleepis listed in bothPROGSandUNIX_PROGSwhereas all other utils are listed only in one of those two lists.This PR removes
sleepfromUNIX_PROGS. I removed it fromUNIX_PROGSand not fromPROGSbecause there is no special handling ofsleepinCargo.toml.