Fix build: remove call to removed method

This backend absolutely does not make sense to use on anything
resembling a "desktop computer" as bshah explained to me. Still, I
somehow have the corresponding optional dependencies installed and
so I triggered the problem.

Reviewed-By: bshah

plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp

@@ -30,7 +30,6 @@ EglHwcomposerBackend::EglHwcomposerBackend(HwcomposerBackend *backend)
 {
     // EGL is always direct rendering
     setIsDirectRendering(true);
-    setBlocksForRetrace(true);
 }
 
 EglHwcomposerBackend::~EglHwcomposerBackend()