[fuchsia] Don't try to use calling executable path to load .so's Bug: angleproject:6964 Change-Id: I856bdbcb83826c6af88ffa79c2a97b97ca827c85 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3427639 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>