Absolute cc compiler path #150
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[`toolchains_llvm`][1] only triggers its logic to locate files relative to the compiler wrapper when called with an absolute path, for example. Otherwise it assumes it's being called from the bazel execroot, which is not true in this case. `toolchains_llvm` already has similar logic as `wheel_builder` for mapping paths, which could be used by just calling it with an absolute path instead of using `wheel_builder`'s wrapper, but I think it's easier to use the `wheel_builder` version instead of trying to detect whether the toolchain has this logic. [1]: https://github.com/bazel-contrib/toolchains_llvm/blob/1d685a99db5f1e6523c392e7dfaced583062cbc4/toolchain/cc_wrapper.sh.tpl#L37
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supersedes #104