Error CL_OUT_OF_HOST_MEMORY when calling clCreateCommandQueueWithProperties.
subj!
ubuntu 16.4.3,  driver amdgpu-pro-17.40-492261
Here is the full output:
```
:~/xmrig-amd/build$ ./xmrig-amd 
 * VERSIONS:     XMRig/2.4.3-beta2 libuv/1.8.0 OpenCL/2.0 gcc/5.4.0
 * CPU:           x64 -AES-NI
 * ALGO:         cryptonight, donate=5%
 * POOL #1:      pool.electroneum.hashvault.pro:3333
 * COMMANDS:     hashrate, pause, resume
[2018-01-03 11:23:57] compiling code and initializing GPUs. This will take a while...
[2018-01-03 11:23:57] found AMD platform index: 0, name: Advanced Micro Devices, Inc.
[2018-01-03 11:23:57] found OpenCL GPU: AMD Radeon HD 7800 Series, cu: 10
[2018-01-03 11:23:57] #0, GPU #0 AMD Radeon HD 7800 Series, intensity: 640 (8/256), cu: 10
[2018-01-03 11:23:57] Error CL_OUT_OF_HOST_MEMORY when calling clCreateCommandQueueWithProperties.
[2018-01-03 11:23:57] Failed to start threads
```
