Update find_sdk.py to not rely on xcode-select or xcrun.

This CL is not intended to introduce any functional changes.

Bug: 971452
Change-Id: I5bd1880b52063b00a8f56b8252e82bcb3ee0c77f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1646546
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Erik Chen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#666885}
1 file changed