[Buildroot] [Bug 3307] synergy fails to build due to missing XTest library

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3307

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni at free-electrons.com>  ---
Created attachment 3001
  --> https://bugs.busybox.net/attachment.cgi?id=3001
Buildroot configuration file

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