config: ruby: Get rid of an "eval" and an "exec" operating on generated code.
config: ruby: Get rid of an "eval" and an "exec" operating on generated code.

We can get the same result using importlib.
(transplanted from f9fb64a72259a2514080151b5250a04c575d443a)

LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5