After https://chromium-review.googlesource.com/c/angle/angle/+/2580918
angle_unittests will not run on OSX when it is non component build
and metal_shader_cache_file_hooking is a shared library:
dyld: Library not loaded: ./libmetal_shader_cache_file_hooking.dylib

Bug: angleproject:5565
Change-Id: I1ac43d928cfaff692aa233c2ba3504a73573ee3e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2640173Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>