Various modifications to debug and/or fix `make check-stage1`#13753

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pnkfelix wants to merge 9 commits intorust-lang:masterfrom

pnkfelix:fsk-hack-issue13732

Commits on Apr 25, 2014

Added `--install-prefix PATH` for overriding embedded `env!($CFG_PREFIX)`
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Include file paths when dumping the list of resolved crates via `debug!`.
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stage1: use `--install-prefix` to point at stage1 dir instead of `CFG_PREFIX`.
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Refactoring: Introduce distinct host and target rpath var setters.
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run-make tests must distinguish between HOST_RPATH and TARGET_RPATH.
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Output debug info on how `#[phase] extern crate foo;` gets resolved.
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Pass stage to maketest.py; it in turn passes it (via an env var) to run-make tests.
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Skip these tests at stage1.
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Fix syntactic mistake in earlier definition of FAILS.
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