When TSAN is enabled, it catches some bad memory access in the NVIDIA
driver on Linux during glLinkProgram with multithreaded linking.
To workaround this, assume we don't have native support for
KHR_parallel_shader_compile

Bug: chromium:1094869
Change-Id: I92f042b39028df108de2c5378311cc0c7b683e08
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2250938Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>