{bintools,cc}-wrapper: fix static builds on Darwin

Without this change, all Darwin platforms mangle to the same suffix
salt. That is normally not an issue because build = host should mean a
non-cross build, but it causes issues on Darwin with static builds
because `DEVELOPER_DIR_FOR_BUILD` and `DEVELOPER_DIR` will refer to
different SDKs but mangle to the same `DEVELOPER_DIR` with suffix salt.

The fix is to mangle static builds differently from non-static ones on
Darwin, which allows building for a static Darwin target on a
same-architecture Darwin host. This fix is applied only to Dariwn
because the issue does not appear to affect other platforms.

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