cuda8.0_cudnn7_avx_mkl build fails

https://paddleci.ngrok.io/viewLog.html?buildId=30529&buildTypeId=Manylinux1_Cuda8cudnn7cp27cp27mu&tab=buildLog&_focus=16189

```
/paddle/paddle/cuda/include/hl_warpctc_wrap.h:18:17: fatal error: ctc.h: No such file or directory
[03:36:24]	 #include "ctc.h"
```

cpai is missing the declaration of gserver dependency in cmakelist, which leads to racing condition while building. 