rustc_llvm: re-run build script when env var LLVM_CONFIG changes #42985
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This removes the changes done in #42429 and use the newly introduced
cargo:rerun-if-env-changed
in rust-lang/cargo#4125.As
LLVM_CONFIG
env var points to thellvm-config
and changes when it gets configured inconfig.toml
or removed from it, we can re-run the build script if this env var changes.closes #42444
r? @alexcrichton