message: dont set rustflags when no specific linker needed
diff: @@ -44,7 +44,11 @@ fi
  dir=$(cd "$(dirname "${BASH_SOURCE[0]}")"; pwd)
  export RUSTC=$dir"/bin/cg_clif"
  +
  +if [ ! -z $linker ]; then
  export RUSTFLAGS=$linker" "$RUSTFLAGS
  +fi
  +
  export RUSTDOCFLAGS=$linker' -Cpanic=abort -Zpanic-abort-tests '\
  '-Zcodegen-backend='$dir'/lib/librustc_codegen_cranelift.'$dylib_ext' --sysroot '$dir
  