Use whereis to find setcap install location and cut to trim the output

<Dan_C> DigitalMan: minor install issue noted today - during a fresh (Linux) install on a test box, the build failed because it was unable to execute the "sudo setcap ..." command.  This was on Slackware 15.0, where the setcap executable is located in /sbin , and that directory is not in the $PATH of a normal user, or even when a normal user uses the 'sudo' command.
14 jobs for master in 11 minutes and 30 seconds (queued for 15 seconds)
Status Job ID Name Coverage
  Build
passed #33198
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jsdoor-freebsd

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jsdoor-linux

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jsdoor-windows

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sbbs-freebsd

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sbbs-linux

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sbbs-windows

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sexpots-freebsd

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sexpots-linux

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sexpots-windows

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syncdraw-freebsd

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syncdraw-linux

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syncterm-freebsd

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syncterm-linux

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passed #33195
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syncterm-windows

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