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Rollup merge of rust-lang#32729 - pierzchalski:build_helper_suffix, r=alexcrichton
Change build helper to modify suffix
The current implementation of [gcc](https://crates.io/crates/gcc) defaults to using the ```CC``` environment variable to determine the compiler. The current global-find-replace in ```build_helper``` causes issues for projects using tools like ```ccache``` if they try to integrate libstd into their build system.
Almost all cross-compiler toolchains have the tool name as a suffix of the filename, so changing this to suffix-replacement instead of global-replacement should be fine.
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