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The compiler needs additional flags `-isystem ...` and `-iframework ...`
to point to the iOS support headers and libraries to build iOS apps with
the macOS SDK (which is how "catalyst" builds work).

The app build for "catalyst" environment have the same bundle structure
as a regular macOS app, so the linker flag for `-rpath ...` needs to be
adjusted to work in that environment.

Bug: 1138425
Change-Id: I4cb8126d111a825408d5a63f248e56cfca99de8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498546
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821760}