examples: fix handling optional libraries in target_link_libraries()
authorAntonio Ospite <ao2@ao2.it>
Tue, 30 Dec 2014 22:47:04 +0000 (23:47 +0100)
committerAntonio Ospite <ao2@ao2.it>
Tue, 30 Dec 2014 22:47:04 +0000 (23:47 +0100)
am7xxx-play can compile just fine without XCB, but cmake was being
overly strict when XCB was missing.


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