Fix ROCKSDB_PLUGIN typo in get_rocksdb_files.sh

[adregner]

I'm guessing this was copy/pasted from a Makefile sort of syntax, whereas it meant to include the contents of these environment variables in this bash script. When I tried to build mysqld from this it was crashing here saying things like ROCKSDB_PLUGIN_BUILTINS: command not found because this syntax in bash means to execute a subcommand.

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