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xcrun: actually try fallbacks
xcrun has a lot of fallbacks if the first case fails but never actually reaches them on CLT systems since it doesn't check the validity of the first path before executing it. (When should it reach these? Mainly for non-Xcode compilers we support, e.g. apple-gcc42 which can be found by xcrun but which isn't in /usr/bin) The xcrun invocation also needed chomping.
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