message: Don't overwrite RUSTFLAGS for cargo.sh
diff: @@ -42,7 +42,7 @@ fi
  dir=$(cd "$(dirname "${BASH_SOURCE[0]}")"; pwd)
  export RUSTC=$dir"/cg_clif"
  -export RUSTFLAGS=$linker
  +export RUSTFLAGS=$linker" "$RUSTFLAGS
  export RUSTDOCFLAGS=$linker' -Cpanic=abort -Zpanic-abort-tests '\
  '-Zcodegen-backend='$dir'/librustc_codegen_cranelift.'$dylib_ext' --sysroot '$dir'/sysroot'
  