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8567e3a5c7
This lets us drop various patches and go all the way to a very clean setup. In case folks are curious what was going on... we were depending on the toolchain finding stdlib headers as sibling files of `clang++`, and for linking we were providing a `-resource-dir` containing the runtime libs. However, some users of the cc toolchain (such as rust build scripts) do the equivalent of `$CC $CCFLAGS $LDFLAGS` so the `-resource-dir` was being passed when compiling, which suppressed the default stdlib header location logic. The upstream fix was to swap to using `-isystem` to pass the stdlib headers, while carefully controlling the ordering to simulate them coming from the resource-dir.