simplify the CMakeLists.txt of trainer/tests
simplify the CMakeLists.txt of trainer/tests

Canpio/Paddle,pkuyym/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,pkuyym/Paddle,reyoung/Paddle,reyoung/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,jacquesqiao/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,baidu/Paddle,QiJune/Paddle,putcn/Paddle,putcn/Paddle,Canpio/Paddle,chengduoZH/Paddle,pkuyym/Paddle,lcy-seso/Paddle,tensor-tang/Paddle,putcn/Paddle,tensor-tang/Paddle,QiJune/Paddle,putcn/Paddle,PaddlePaddle/Paddle,putcn/Paddle,luotao1/Paddle,reyoung/Paddle,pkuyym/Paddle,lcy-seso/Paddle,Canpio/Paddle,luotao1/Paddle,jacquesqiao/Paddle,jacquesqiao/Paddle,reyoung/Paddle,lcy-seso/Paddle,luotao1/Paddle,luotao1/Paddle,tensor-tang/Paddle,chengduoZH/Paddle,QiJune/Paddle,baidu/Paddle,baidu/Paddle,Canpio/Paddle,jacquesqiao/Paddle,QiJune/Paddle,lcy-seso/Paddle,Canpio/Paddle,tensor-tang/Paddle,QiJune/Paddle,luotao1/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,lcy-seso/Paddle,Canpio/Paddle,chengduoZH/Paddle,putcn/Paddle,baidu/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,chengduoZH/Paddle,tensor-tang/Paddle,baidu/Paddle,chengduoZH/Paddle,pkuyym/Paddle,lcy-seso/Paddle