Vulkan: Use correct Linux link flags for layers. From third_party/vulkan-validation-layers/src/layers/CMakeLists.txt Otherwise, there is a conflict between global functions with same name from different layers and the loader. Conflict is resolved by -Bsymbolic. BUG=angleproject:2296 Change-Id: I40859326626c3865ba346c6e817b7c512735054e Reviewed-on: https://chromium-review.googlesource.com/850727 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>