message: Remove unused dylib_ext variable from build.sh
diff: @@ -34,7 +34,6 @@ if [[ "$unamestr" == 'Linux' || "$unamestr" == "FreeBSD" ]]; then
  export RUSTFLAGS='-Clink-arg=-Wl,-rpath=$ORIGIN/../lib '$RUSTFLAGS
  elif [[ "$unamestr" == 'Darwin' ]]; then
  export RUSTFLAGS='-Csplit-debuginfo=unpacked -Clink-arg=-Wl,-rpath,@loader_path/../lib -Zosx-rpath-install-name '$RUSTFLAGS
  - dylib_ext='dylib'
  else
  echo "Unsupported os $unamestr"
  exit 1
  