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Xcode 12 added support for real response files, so let's use them.
Allows making response file contents more like on other systems
(libs, solibs, frameworks, swiftmodules now go in the rsp file too),
and makes it theoretically possible to have object files with spaces
in their name.

No intentional behavior change.

Bug: none
Change-Id: I8c2d6ff1abd47261bf7674dc7bf4506814681ad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527621
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825480}