Vulkan: Update dEQP source for test fixes Also fix scripts/gen_vk_gl_cts_build.py to always use '/' as file separator. Otherwise, running the script on Windows uses '\' which Linux doesn't like. Test: angle_deqp_gles31_tests --use-angle=swiftshader --gtest_filter=dEQP.GLES31/functional_debug_negative_coverage_get_error_vertex_array_draw_range_elements Bug: angleproject:2324 Bug: angleproject:4234 Change-Id: I3b212e0d0ba97996f1d86f7fc81e58c3b03a9cbb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1975020 Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>