Update README TRELLIS_INSTALL_PREFIX example
per https://github.com/YosysHQ/nextpnr/pull/406#discussion_r387937313 it is not an install directory
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@ -98,7 +98,7 @@ such as pack, place, route, and write output files.)
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For ECP5 support, you must download [Project Trellis](https://github.com/SymbiFlow/prjtrellis),
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then follow its instructions to download the latest database and build _libtrellis_.
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(for example: `-DTRELLIS_INSTALL_PREFIX=/usr` will install to `/usr/share/trellis`)
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(for example: `-DTRELLIS_INSTALL_PREFIX=/usr` tells nextpnr to look in `/usr/share/trellis`)
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```
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cmake -DARCH=ecp5 -DTRELLIS_INSTALL_PREFIX=/path/to/prjtrellis .
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