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A change in dependencies means that a component with a MIDL dependency
(third_party/iacccessible2) is now compiled for the x64 host and arm64.
This caused problems because the host win_clang_x64 generated files
typically live in out/<t>/win_clang_x64/gen/third_party/iaccessible2
whereas the arm64 files live in out/<t>/gen/third_party/iaccessible2,
meaning that (when the path is rebased) the midl action tried to copy
files from a missing win_clang_x64 directory in iaccessible2. Using the
root_gen_dir instead fixes this depth mismatch.

Bug: 1105878
Change-Id: I9403b0024c394b339168e47275d23240b55c3574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302054Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#790105}