[ios] Always use symbolic links to system Xcode in build_root_dir
Goma RBE only supports paths that are relative to the source dir while build not using Goma or using old Goma backend supports both so always use symbolic link to system Xcode on iOS. This fix the compilation for people using Goma as Goma RBE is now the default backend and without this change, the build would fall back to local compilation, drastically slowing the build. Stop using the ios_enable_relative_sdk_path and ios_use_goma_rbe gn variables as they are now always expected to be `true`. Keep the variable ios_use_goma_rbe to avoid breaking the bots that do override the value but ignore it (bot set it to true anyway). Bug: none Change-Id: I2a3c098304594fb20491ab92100e9a4101a048db Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2555117 Commit-Queue: Sylvain Defresne <sdefresne@chromium.org> Reviewed-by:Nico Weber <thakis@chromium.org> Auto-Submit: Sylvain Defresne <sdefresne@chromium.org> Cr-Commit-Position: refs/heads/master@{#830616}
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