** Description changed:

  MySQL 5.7 source package has liblz4-dev as a build-dep, but it isn't
  actually used because the build defaults to using a bundled version.
+ [Impact]
+ No known user impact at present (other than a small difference in binary 
footprint), but builds shouldn't use bundled libraries when it's available in 
the system.
  Add cmake flag -DWITH_LZ4=system to use the correct version.
+ [Test case]
+ * Build package
+ * Run ldd on usr/lib/lz4_decompress and see it doesn't link in liblz4 from 
the system.
+ [Regression potential]
+ This change has been in Yakkety for some time (5.7.15-0ubuntu2).
+ Database dump-related utils like mysqlpump and lz4_decompress could be
+ impacted if any significant changes arise between the version of liblz4
+ available on user systems and what is used to test upstream.

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  Build with lz4 build-dep instead of bundled

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