Fix Musl libc NULL errors and unsupported pthread funcs for compatibility.
Also ensures cleanup and error handling irrespective of CPU affinity override.
Fix submitted by github dev - AngryLoki
https://github.com/ROCm/ROCR-Runtime/issues/181
Change-Id: Ia487315e504112be5d3370756f23f6e23b9ae4be
[ROCm/ROCR-Runtime commit: bc9cac97fe]
This omission did not cause problems earlier due to having not been
instanced.
Change-Id: I7a54f82e06c299902f3bf6b4d3737cc5e30961ad
[ROCm/ROCR-Runtime commit: 322588a60e]