Runtime error with cn/r algo on OSX : Error CL_BUILD_PROGRAM_FAILURE when calling clBuildProgram
Hi,

I'm updating Cryptomac to be ready for upcoming fork and encountered issue when testing new algo (with current algo, it's ok) :

 * ABOUT        XMRig-AMD/2.13.0 clang/9.1.0
 * LIBS         libuv/1.20.0 OpenCL/1.2 OpenSSL/1.0.2n microhttpd/0.9.59 
 * CPU          Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz x64 AES
 * ALGO         cryptonight, donate=1%
 * POOL #1      killallasics.moneroworld.com:3333 variant=auto 
 * API BIND     0.0.0.0:42096
 * COMMANDS     'h' hashrate, 'p' pause, 'r' resume
[2019-03-04 22:53:06] compiling code and initializing GPUs. This will take a while...
[2019-03-04 22:53:06] AMD GPU #0: intensity is not a multiple of 'worksize', auto reduce intensity to 96
[2019-03-04 22:53:06] #00, GPU #00 (Iris Pro), i:96 (8/512), si:2/2, u:8, cu:40
[2019-03-04 22:53:06]              0.19/0.38/2 GB
[2019-03-04 22:53:06] use pool killallasics.moneroworld.com:3333  66.85.74.134
[2019-03-04 22:53:06] new job from killallasics.moneroworld.com:3333 diff 5000 algo cn/r height 1166895
[2019-03-04 22:53:06] Error CL_BUILD_PROGRAM_FAILURE when calling clBuildProgram.
[2019-03-04 22:53:06] CryptonightR: clBuildProgram returned error CL_BUILD_PROGRAM_FAILURE
[2019-03-04 22:53:06] Error CL_INVALID_KERNEL when calling clSetKernelArg for kernel 17, argument 0.
[2019-03-04 22:53:06] Error CL_INVALID_KERNEL when calling clEnqueueNDRangeKernel for kernel 1.