[gn] Fix --sysroot and --clang_prefix values

These calculations were conflating root_build_dir with root_out_dir.
They are sometimes the same but not always.

Bug: SEC-27
Test: Build with select_variant=["asan"]
Change-Id: Ie0bd37356de67b621888189a4b26ce3de03701f6
1 file changed
tree: 37865e37c6808dcdd06097f9e1300138d8b22667
  1. AUTHORS
  2. CONTRIBUTING.md
  3. LICENSE
  4. README.md
  5. rustc_deps/
README.md

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